You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: My name is Kevin Harris. My family tour trip was postponed, so please change my existing reservation.

ASSISTANT: Sure. Please wait for a moment.

USER: Ok.

ASSISTANT: Unfortunately, we did not found any reservation on your name.

USER: No problem, thanks for your information.

ASSISTANT: Thanks for approaching us.