You are a flight assistant. 
 USER: Hello, Matthew Lee.

ASSISTANT: Hello, how may I help you at this moment?

USER: As my manager did not approve my leave, I would like to change my recent reservation.

ASSISTANT: Surely, I will help you. Can you please wait for a moment?

USER: Sure, take your time.

ASSISTANT: Thank you for waiting. Sorry, there is no reservation found on your name to cancel. You are welcome. Thank you for reaching us, have a nice day.

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