diff --git a/src/controllers/conversations_controller.rs b/src/controllers/conversations_controller.rs
index 7060ba1..d33f52b 100644
--- a/src/controllers/conversations_controller.rs
+++ b/src/controllers/conversations_controller.rs
@@ -130,5 +130,13 @@ pub fn update_settings(r: &mut HttpRequestHandler) -> RequestResult {
 
 /// Find a private conversation
 pub fn find_private(r: &mut HttpRequestHandler) -> RequestResult {
+    let other_user = r.post_user_id("otherUser")?;
+    let allow_create = r.post_bool_opt("allowCreate", false);
+
+    // Query the database
+    let list = conversations_helper::find_private(r.user_id()?, other_user)?;
+
+    println!("{:#?}", list);
+
     r.success("implement it")
 }
\ No newline at end of file
diff --git a/src/helpers/conversations_helper.rs b/src/helpers/conversations_helper.rs
index ffcb1d1..f535c65 100644
--- a/src/helpers/conversations_helper.rs
+++ b/src/helpers/conversations_helper.rs
@@ -183,6 +183,22 @@ pub fn set_can_everyone_add_members(conv_id: u64, allow: bool) -> ResultBoxError
         .exec()
 }
 
+/// Search for private conversation between two users
+pub fn find_private(user_1: UserID, user_2: UserID) -> ResultBoxError<Vec<u64>> {
+    database::QueryInfo::new(CONV_USERS_TABLE)
+        .alias("t1")
+
+        // Join
+        .join(CONV_USERS_TABLE, "t2", "t1.conv_id = t2.conv_id")
+
+        // Conditions
+        .cond_user_id("t1.user_id", user_1)
+        .cond_user_id("t2.user_id", user_2)
+        .set_custom_where(format!("(SELECT COUNT(*) FROM {} WHERE conv_id = t1.conv_id) = 2", CONV_USERS_TABLE).as_ref())
+        .add_field("t1.conv_id AS conv_id")
+        .exec(|f|f.get_u64("conv_id"))
+}
+
 /// Turn a database entry into a ConversationInfo object
 fn db_to_conversation_info(row: &database::RowResult) -> ResultBoxError<Conversation> {
     let conv_id = row.get_u64("id")?;
diff --git a/src/helpers/database.rs b/src/helpers/database.rs
index 8fe3ed5..c67f896 100644
--- a/src/helpers/database.rs
+++ b/src/helpers/database.rs
@@ -68,6 +68,9 @@ pub struct QueryInfo {
     /// Query limits
     pub conditions: collections::HashMap<String, String>,
 
+    /// Custom WHERE condition
+    pub custom_where: Option<String>,
+
     /// Limit of the query (0 = no limit)
     pub limit: u64,
 
@@ -88,6 +91,7 @@ impl QueryInfo {
             table_alias: None,
             joins: Vec::new(),
             conditions: collections::HashMap::new(),
+            custom_where: None,
             limit: 0,
             order: None,
             fields: Vec::new(),
@@ -134,6 +138,12 @@ impl QueryInfo {
         self
     }
 
+    /// Set custom where
+    pub fn set_custom_where(mut self, custom_where: &str) -> QueryInfo {
+        self.custom_where = Some(custom_where.to_string());
+        self
+    }
+
     /// Append a field to the list of selected fields
     pub fn add_field(mut self, key: &str) -> QueryInfo {
         self.fields.push(key.to_string());
@@ -340,6 +350,11 @@ pub fn query<E, F: Fn(&RowResult) -> ProcessRowResult<E>>(info: QueryInfo, proce
         query = query.add(&where_args);
     }
 
+    // Custom WHERE clause
+    if let Some(custom_where) = info.custom_where {
+        query = query.add(format!(" AND ({})", custom_where).as_str());
+    }
+
     // ORDER clause
     if let Some(order) = info.order {
         query = query.add(format!(" ORDER BY {} ", order).as_str());