Re-query speaker name when multiple speaker names returned during Group Chat speaker selection

autogen/agentchat/conversable_agent.py

@@ -576,6 +576,11 @@ def _append_oai_message(self, message: Union[Dict, str], role, conversation_id:
 
         if message.get("role") in ["function", "tool"]:
             oai_message["role"] = message.get("role")
+        elif "override_role" in message:
+            # If we have a direction to override the role then set the
+            # role accordingly. Used to customise the role for the
+            # select speaker prompt.
+            oai_message["role"] = message.get("override_role")
         else:
             oai_message["role"] = role