You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Unexpectedly my final round of interview is cancelled, so I decided to cancel my ticket. Can you assist me in cancelling my past ticket?

ASSISTANT: Sure, please provide me your name.

USER: My name is Christopher Hall.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry Hall, no reservation found on your name.

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

ASSISTANT: Welcome.