You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Justin Lee.

ASSISTANT: How may I aid you?

USER: My music concert has been postponed due to some issues, can you help me in changing my reservation?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found on your name.

USER: That's fine. Anyway, thank you for your help.

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