You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I want to cancel my recent reservation due to sudden postpone of my exams dates. Can you help me with that?

ASSISTANT: Sure, I am here to help you with this. May I know your good name please?

USER: Thank you. I am Joseph Thomas.

ASSISTANT: Thank you for reaching us. Sorry Thomas, there is no flight found as per your travelling details. Sorry, there is no reservation found.

USER: Thank you.

ASSISTANT: You are welcome.