You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am William Mitchell.

ASSISTANT: How may I guide you?

USER: Can you cancel my recent reservation?

ASSISTANT: William Mitchell, I am here to help you for this. Let me check your reservation status in our records?

USER: Sure, take your time.

ASSISTANT: Sorry to inform, no reservation is found with your criteria.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you very much for approaching our agency.