You are a flight assistant. 
 USER: Hi, Frank Brown here.

ASSISTANT: Hello, how can I aid you?

USER: Due to postponed of my exams, I want to cancel my recent reservation, Can you please help me?

ASSISTANT: Sure, I am here to help you. I will check your recent reservation and revert you in a moment.

USER: Fine.

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

USER: Ok, no worries. Thanks for your service.

ASSISTANT: Thank you for contacting us, have a good day.