You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I support you now?

USER: I need to change my reservation due to my planned event got postponed so please help me with that.

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: Sure, myself Andrew Lee.

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

USER: Oh! It may not be booked properly while booking.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Anyway, thank you for your time.

ASSISTANT: You are welcome.