diff --git a/geneit_app/src/api/accommodations/AccommodationListApi.tsx b/geneit_app/src/api/accommodations/AccommodationListApi.tsx
index 9125d3f..e9a595d 100644
--- a/geneit_app/src/api/accommodations/AccommodationListApi.tsx
+++ b/geneit_app/src/api/accommodations/AccommodationListApi.tsx
@@ -45,6 +45,10 @@ export class AccommodationsList {
     return this.list.filter(predicate);
   }
 
+  get openToReservationList(): Accommodation[] {
+    return this.filter((a) => a.open_to_reservations);
+  }
+
   get(id: number): Accommodation | undefined {
     return this.map.get(id);
   }
diff --git a/geneit_app/src/api/accommodations/AccommodationsReservationsApi.tsx b/geneit_app/src/api/accommodations/AccommodationsReservationsApi.tsx
index b5d469f..845372a 100644
--- a/geneit_app/src/api/accommodations/AccommodationsReservationsApi.tsx
+++ b/geneit_app/src/api/accommodations/AccommodationsReservationsApi.tsx
@@ -1,6 +1,5 @@
 import { APIClient } from "../ApiClient";
 import { Family } from "../FamilyApi";
-import moment from "moment";
 
 export interface AccommodationReservation {
   id: number;
@@ -56,6 +55,12 @@ export class AccommodationsReservationsList {
   }
 }
 
+export interface UpdateAccommodationReservation {
+  start: number;
+  end: number;
+  accommodation_id: number;
+}
+
 export class AccommodationsReservationsApi {
   /**
    * Get the entire list of accommodations of a family
diff --git a/geneit_app/src/dialogs/accommodations/UpdateReservationDialog.tsx b/geneit_app/src/dialogs/accommodations/UpdateReservationDialog.tsx
new file mode 100644
index 0000000..75fc5e4
--- /dev/null
+++ b/geneit_app/src/dialogs/accommodations/UpdateReservationDialog.tsx
@@ -0,0 +1,86 @@
+import {
+  Button,
+  Dialog,
+  DialogActions,
+  DialogContent,
+  DialogTitle,
+} from "@mui/material";
+import React from "react";
+import { UpdateAccommodationReservation } from "../../api/accommodations/AccommodationsReservationsApi";
+import { useAccommodations } from "../../widgets/accommodations/BaseAccommodationsRoute";
+import { PropSelect } from "../../widgets/forms/PropSelect";
+
+export function UpdateReservationDialog(p: {
+  open: boolean;
+  create: boolean;
+  reservation?: UpdateAccommodationReservation;
+  onClose: () => void;
+  onSubmitted: (c: UpdateAccommodationReservation) => void;
+}): React.ReactElement {
+  const accommodations = useAccommodations();
+
+  const [reservation, setReservation] = React.useState<
+    UpdateAccommodationReservation | undefined
+  >();
+
+  const clearForm = () => {
+    setReservation(undefined);
+  };
+
+  const cancel = () => {
+    clearForm();
+    p.onClose();
+  };
+
+  const submit = async () => {
+    clearForm();
+    p.onSubmitted(reservation!);
+  };
+
+  React.useEffect(() => {
+    if (!reservation) setReservation(p.reservation);
+  }, [p.open, p.reservation]);
+
+  return (
+    <Dialog open={p.open} onClose={cancel}>
+      <DialogTitle>
+        {p.create ? "Création" : "Mise à jour"} d'une réservation
+      </DialogTitle>
+      <DialogContent style={{ display: "flex", flexDirection: "column" }}>
+        <PropSelect
+          editing={p.create}
+          label="Logement ciblé"
+          onValueChange={(v) => {
+            setReservation((a) => {
+              return {
+                ...a!,
+                accommodation_id: Number(v),
+              };
+            });
+          }}
+          options={accommodations.accommodations.openToReservationList.map(
+            (a) => {
+              return { label: a.name, value: a.id.toString() };
+            }
+          )}
+          value={reservation?.accommodation_id?.toString()}
+        />
+
+        {/* TODO : la suite */}
+      </DialogContent>
+      <DialogActions>
+        <Button onClick={cancel}>Annuler</Button>
+        <Button
+          onClick={submit}
+          disabled={
+            (reservation?.accommodation_id ?? -1) > 0 &&
+            (reservation?.start ?? -1) > 0 &&
+            (reservation?.end ?? -1) > (reservation?.start ?? 0)
+          }
+        >
+          {p.create ? "Créer" : "Mettre à jour"}
+        </Button>
+      </DialogActions>
+    </Dialog>
+  );
+}
diff --git a/geneit_app/src/hooks/context_providers/accommodations/UpdateReservationDialogProvider.tsx b/geneit_app/src/hooks/context_providers/accommodations/UpdateReservationDialogProvider.tsx
new file mode 100644
index 0000000..e22b6ab
--- /dev/null
+++ b/geneit_app/src/hooks/context_providers/accommodations/UpdateReservationDialogProvider.tsx
@@ -0,0 +1,64 @@
+import React, { PropsWithChildren } from "react";
+import { UpdateAccommodationReservation } from "../../../api/accommodations/AccommodationsReservationsApi";
+import { UpdateReservationDialog } from "../../../dialogs/accommodations/UpdateReservationDialog";
+
+type DialogContext = (
+  reservation: UpdateAccommodationReservation,
+  create: boolean
+) => Promise<UpdateAccommodationReservation | undefined>;
+
+const DialogContextK = React.createContext<DialogContext | null>(null);
+
+export function UpdateReservationDialogProvider(
+  p: PropsWithChildren
+): React.ReactElement {
+  const [open, setOpen] = React.useState(false);
+
+  const [reservation, setReservation] = React.useState<
+    UpdateAccommodationReservation | undefined
+  >(undefined);
+  const [create, setCreate] = React.useState(false);
+
+  const cb = React.useRef<
+    null | ((a: UpdateAccommodationReservation | undefined) => void)
+  >(null);
+
+  const handleClose = (res?: UpdateAccommodationReservation) => {
+    setOpen(false);
+
+    if (cb.current !== null) cb.current(res);
+    cb.current = null;
+  };
+
+  const hook: DialogContext = (accommodation, create) => {
+    setReservation(accommodation);
+    setCreate(create);
+    setOpen(true);
+
+    return new Promise((res) => {
+      cb.current = res;
+    });
+  };
+
+  return (
+    <>
+      <DialogContextK.Provider value={hook}>
+        {p.children}
+      </DialogContextK.Provider>
+
+      {open && (
+        <UpdateReservationDialog
+          open={open}
+          reservation={reservation}
+          create={create}
+          onClose={handleClose}
+          onSubmitted={handleClose}
+        />
+      )}
+    </>
+  );
+}
+
+export function useUpdateAccommodationReservation(): DialogContext {
+  return React.useContext(DialogContextK)!;
+}
diff --git a/geneit_app/src/routes/family/accommodations/AccommodationsReservationsRoute.tsx b/geneit_app/src/routes/family/accommodations/AccommodationsReservationsRoute.tsx
index 4bcb28f..2fa5c6e 100644
--- a/geneit_app/src/routes/family/accommodations/AccommodationsReservationsRoute.tsx
+++ b/geneit_app/src/routes/family/accommodations/AccommodationsReservationsRoute.tsx
@@ -17,6 +17,7 @@ import {
   AccommodationsReservationsApi,
   AccommodationsReservationsList,
 } from "../../../api/accommodations/AccommodationsReservationsApi";
+import { useUpdateAccommodationReservation } from "../../../hooks/context_providers/accommodations/UpdateReservationDialogProvider";
 import { AsyncWidget } from "../../../widgets/AsyncWidget";
 import { useFamily } from "../../../widgets/BaseFamilyRoute";
 import { FamilyPageTitle } from "../../../widgets/FamilyPageTitle";
@@ -27,6 +28,7 @@ export function AccommodationsReservationsRoute(): React.ReactElement {
 
   const family = useFamily();
   const accommodations = useAccommodations();
+  const updateReservation = useUpdateAccommodationReservation();
 
   const [reservations, setReservations] = React.useState<
     AccommodationsReservationsList | undefined
@@ -57,7 +59,17 @@ export function AccommodationsReservationsRoute(): React.ReactElement {
   };
 
   const onSelect = (d: DateSelectArg) => {
+    // TODO : render this functional
+    // TODO : handle busy case
     console.info(d);
+    updateReservation(
+      {
+        accommodation_id: -1,
+        start: Math.floor(d.start.getDate() / 1000),
+        end: Math.floor(d.end.getDate() / 1000),
+      },
+      true
+    );
   };
 
   return (
diff --git a/geneit_app/src/widgets/accommodations/BaseAccommodationsRoute.tsx b/geneit_app/src/widgets/accommodations/BaseAccommodationsRoute.tsx
index 5e6b24b..b34ae3d 100644
--- a/geneit_app/src/widgets/accommodations/BaseAccommodationsRoute.tsx
+++ b/geneit_app/src/widgets/accommodations/BaseAccommodationsRoute.tsx
@@ -5,10 +5,11 @@ import {
   AccommodationsList,
 } from "../../api/accommodations/AccommodationListApi";
 import { CreateAccommodationCalendarURLDialogProvider } from "../../hooks/context_providers/accommodations/CreateAccommodationCalendarURLDialogProvider";
+import { InstallCalendarDialogProvider } from "../../hooks/context_providers/accommodations/InstallCalendarDialogProvider";
 import { UpdateAccommodationDialogProvider } from "../../hooks/context_providers/accommodations/UpdateAccommodationDialogProvider";
+import { UpdateReservationDialogProvider } from "../../hooks/context_providers/accommodations/UpdateReservationDialogProvider";
 import { AsyncWidget } from "../AsyncWidget";
 import { useFamily } from "../BaseFamilyRoute";
-import { InstallCalendarDialogProvider } from "../../hooks/context_providers/accommodations/InstallCalendarDialogProvider";
 
 interface AccommodationsContext {
   accommodations: AccommodationsList;
@@ -65,7 +66,9 @@ export function BaseAccommodationsRoute(): React.ReactElement {
             <UpdateAccommodationDialogProvider>
               <CreateAccommodationCalendarURLDialogProvider>
                 <InstallCalendarDialogProvider>
-                  <Outlet />
+                  <UpdateReservationDialogProvider>
+                    <Outlet />
+                  </UpdateReservationDialogProvider>
                 </InstallCalendarDialogProvider>
               </CreateAccommodationCalendarURLDialogProvider>
             </UpdateAccommodationDialogProvider>