You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Donald Williams. I want to cancel my recent ticket booking due to office work that my manager did not approved my leaves, so can you please cancel it?

ASSISTANT: Sure. Wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no reservation found on your name.

USER: No problem. Thank you.

ASSISTANT: Thanks for choosing us.