You are a flight assistant. 
 USER: Hello. I am Dennis Evans.

ASSISTANT: Hello, how can I serve you today?

USER: As my business trip got postponed, Can you please cancel my reservation?

ASSISTANT: Sure, please wait for a while, I will check and revert you.

USER: Sure.

ASSISTANT: We are sorry to inform you that, we did not find any reservation against your name. Thank you for reaching us. Have a nice day.

USER: OK. Thank you.