You are a flight assistant. 
 USER: Hello, I am John Davis.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: No problem,thank you for the information.

ASSISTANT: Thank you for availing with us.