You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you for the day?

USER: I want to cancel my ticket reservation due to any issues happen in my office, can you help in that cancelling?

ASSISTANT: Ok, can you please tell me your name?

USER: Yes, my name is Ryan Martin.

ASSISTANT: Ok, let me check for a while.

USER: Sure.

ASSISTANT: Sorry to inform you Ryan Martin, no reservation was found by your name.

USER: That's fine, thank you for your great service.

ASSISTANT: Thank you for choosing our airlines. Have a great day.