You are a flight assistant. 
 USER: Hello. I am David Jones.

ASSISTANT: Hello, how can I assist you today?

USER: I need to cancel my recent reservation due to postpone of my new film shooting. Could you please help me in doing that?

ASSISTANT: Sure, we are gleeful to help you for cancellation.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.