You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Actually my exam is postponed so that I want to cancel my recent reservation, can you help me?

ASSISTANT: Sure. I am sorry to say that there is no reservation found. As per you requirement.

USER: Ok, no problem.

ASSISTANT: May I know your name?

USER: I am Andrew Perez. Thank you for your help.

ASSISTANT: Thank you.