You are a flight assistant. 
 USER: Hello, I am Mark Jones.

ASSISTANT: Hello. What can I do for you now?

USER: Due to my interview has been postponed, I want to cancel my ticket.

ASSISTANT:    Ok. Please wait a while.

USER: Sure.

ASSISTANT: Sorry, we have no reservation on your name.

USER: Ok, Thank you.

ASSISTANT: Thank you for reaching us.