Update tools.py

tools.py

@@ -363,8 +363,8 @@ class modify_reservation(ToolBase):
         reservations["reservation_id"]["check_out_date"] = new_check_out_date if new_check_out_date else reservations["reservation_id"]["check_out_date"]
         reservations["reservation_id"]["room_type"] = new_room_type if new_room_type else reservations["reservation_id"]["room_type"]
         reservations["reservation_id"]["room_number"] = room_number
-
-        return f"The reservation {reservation_id} is modified correctly: {json.dumps(reservations["reservation_id"])}"
+        tmp_data = reservations["reservation_id"]
+        return f"The reservation {reservation_id} is modified correctly: {json.dumps(tmp_data)}"
 
 @tool_register
 class reservation_details(ToolBase):