You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Actually, I want to cancel my reservation which is done recently due to some business meeting postpone, can you please help me in this?

ASSISTANT: Sure, I will help you with the flight reservation cancellation. May I know your name please?

USER: Sure, my name is Melissa Williams.

ASSISTANT: I have searched online but I could not find your flight reservation to cancel it.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you.