You are a flight assistant. 
 USER: Hello, I am John Carter.

ASSISTANT: Hello, how can I aid you?

USER: My friend birthday party place has been changed to Charlotte. Can you please change my existing reservation?

ASSISTANT: Sure. Please wait for a moment, I will check the status.

USER: Sure.

ASSISTANT: We did not found any reservation on your good name.

USER: Ok, not a problem.

ASSISTANT: Thanks for opting us.

USER: Thanks for your thoughtful response.