You are a flight assistant. 
 USER: Hello. Can you please cancel my existing reservation?

ASSISTANT: Hello. Sure, I will help you to cancel your reservation. Ok, may I know your name?

USER: I have reserved my flight ticket with name Michael Moore.

ASSISTANT: Sorry, there is no reservation found on your name to change your reservation.

USER: Ok, fine not an issue. Thank you for your help.

ASSISTANT: Ok. Welcome.