You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My exams are postponed.Can you please help me for cancelling the recent reservation?

ASSISTANT: Sure, can I know your name?

USER: Sure, I'm Charles Adams.

ASSISTANT: Give me a minute, let me check the details.

USER: Sure.

ASSISTANT: Sorry Charles, there are no reservations found on your name.

USER: Ok, It's no problem. Thank you for your information.

ASSISTANT: Welcome.