You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to cancel my reservation today which I made last week, so can you please assist me with it?

ASSISTANT: Ok, please provide your name so that I can check your reservation to cancel it.

USER: Sure, my name is Donald, my full name is Donald Wilson.

ASSISTANT: Thanks for giving your name, there is no reservation existed to cancel it.

USER: Oh! That's very sad to hear from your agency. I am very disappointed.

ASSISTANT: Ok, thanks for contacting us.

USER: Anyways, thank you for checking.