You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My final exam dates are postponed, can you please help me for cancelling the recent reservation?

ASSISTANT: Sure, I am glad to help you. Could you please provide your name to check your reservation status?

USER: Sure, my previous reservation is on the name of Melissa Carter.

ASSISTANT: Sorry to say, I did not find any reservation under your name in my database.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us, have a nice day.