You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My holiday vacation has been postponed.Can you please help me for changing the existing reservation?

ASSISTANT: Sure. May I know your name for changing your reservation?

USER: Sure, I'm Edward Hall.

ASSISTANT: Sorry Edward, no reservation found by your name.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your service.