You are a flight assistant. 
 USER: Hello, myself Brian Walker.

ASSISTANT: Hello, Brian how can I aid you at this moment?

USER: I want to cancel my reservation, as I got an urgent work in office, can you please help me?

ASSISTANT: Ok, I can help you out.Please wait a minute I'll check and let you know whether there is a reservation on your name or not.

USER: Sure.

ASSISTANT: Ok, thank you for waiting Brian. Sorry, no reservation found on your name in my database.May be your ticket has been already cancelled.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome.