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

ASSISTANT: Hello, can you please tell me how can I assist you?

USER: I need to cancel my recent reservation due to postpone of interview.

ASSISTANT: Ok, please wait for a minute.

USER: Could you please help me in cancelling the reservation?

ASSISTANT: Ok. Sorry to inform you, no reservation found on your name in my database.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for  reaching us.