Update conversation.py

api/controllers/service_api/app/conversation.py

@@ -1,6 +1,5 @@
 from flask_restful import Resource, marshal_with, reqparse  # type: ignore
 from flask_restful.inputs import int_range  # type: ignore
-from sqlalchemy import select
 from sqlalchemy.orm import Session
 from werkzeug.exceptions import NotFound