You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How shall I assist you?

USER: I would like to cancel my reservation as I have got some urgent work at my office. Could you please do that for me?

ASSISTANT: Please let me know your name?

USER: My name is Joseph Mitchell.

ASSISTANT: Ok.

USER: Sure.

ASSISTANT: No reservation found. Thank you.

USER: No problem, thank you very much for checking.