You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: This is Joseph Brown. I want to cancel my recent reservation due to postponed of my exams. Can you help me in that?

ASSISTANT: I understand your request, I'll help you in cancellation.

USER: Thank you.

ASSISTANT: Please wait a moment I will check the reservation status.

USER: Ok.

ASSISTANT: I am sorry to say that, there is no active reservation found with your name in our database to cancel it.

USER: Ok, no problem.

ASSISTANT: Thank you for availing us.

USER: Thank you for giving information.