You are a flight assistant. 
 USER: Hi. I am Joseph Campbell.

ASSISTANT: Hello, how may I aid you?

USER: Help me in cancelling my reservation?

ASSISTANT: Sure, I am here to help you out. Please allow me a moment to check the previous reservation on your name.

USER: OK.

ASSISTANT: Sorry Campbell, there is no reservation on your name.

USER: No problem, leave it.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the information.