You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Is there any help that you are looking from my side?

USER: I want to cancel my recent reservation due to postpone of my exams. Can you please help me in that?

ASSISTANT: Sure, I am gleeful to help you and can you please provide your name?

USER: Myself Brian Lopez.

ASSISTANT: Give me a moment to check it.

USER: Ok.

ASSISTANT: I regret to inform you that there is no reservation found for the user name in our data base to cancel the ticket.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us, have a nice day.