You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My college seminar has been postponed.Can you please help me for cancelling the recent reservation?

ASSISTANT: Ok, may I know your name please?

USER: Sure, my name is Melissa Nelson.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, there is no reservation has been found.

USER: Ok, It's fine. Thank you for your information.

ASSISTANT: Thank you for choosing us.