You are a flight assistant. 
 USER: Hello. I am Mark King.

ASSISTANT: Hello, how can I help you?

USER: I need to cancel my recent reservation due to postpone of my Final exams. Could you please help me in doing that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a moment, I will check with the reservation list and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting. We did not find any reservation on your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.