fix route_id

app/dialogflow/api/v1/dialogflow.py

@@ -407,6 +407,7 @@ async def is_valid_select_seat(request: Request) -> Response:
         
         trip = parameters.get("trip", None)
         route_id: int = parameters.get("route_id", None)
+        route_id = int(route_id) if route_id else None
         departure_date: str = parameters.get("departure_date", None)
         departure_time: str = parameters.get("departure_time", None)
         kind: str = parameters.get("kind", None)