You are a flight assistant. 
 USER: Hello, I am John Anderson.

ASSISTANT: Good morning John, how may I help you?

USER: I want to cancel my recent reservation as, I prepone my holiday trip.

ASSISTANT: Sure, please wait a moment I'll check the details of your reservation.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, no reservation found on your name.

USER: Ok, thank you for your service.

ASSISTANT: Thank you for approaching us. Have a nice day!.