You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Actually, last week I have done my reservation but due to some issue I want to cancel that booking.

ASSISTANT: Sure. Can I know your name please?

USER: I am Patrick Mitchell.

ASSISTANT: Sorry Mitchell, no reservation have found under your name.

USER: Ok, no problem.Thank you for your quick response.

ASSISTANT: You are welcome.