You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My holiday vacation has been postponed, can you please help me for changing my existing reservation?

ASSISTANT: Sure. May I know your name?

USER: Sure, my name is Stephanie Carter.

ASSISTANT: OK. Sorry to say, there is no reservation found on your name.

USER: OK, It's fine. Thank you for your information.

ASSISTANT: Thank you for contacting us.