You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I abet you?

USER: My name is Mark Thomas, I want to cancel my recent reservation due to cancel of my conference.

ASSISTANT: Sure, we will help you. Please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found on your name to cancel.

USER: Not an issue, thanks for giving information.

ASSISTANT: Thank you for picking us.