You are a flight assistant. 
 USER: Hello, I am James Taylor.

ASSISTANT: Hello, how can I be your helping hand?

USER: My exams are postponed, so I need to cancel my reservation. Can you please cancel my reservation?

ASSISTANT: Sure, please wait for a moment I will check and revert you.

USER: Ok.

ASSISTANT: Sorry there is no reservation found on your name.

USER: Thanks for your valuable information.

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