You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joseph Martin.

ASSISTANT: How may I assist you?

USER: I would like to cancel my recent reservation due to postpone of my event.

ASSISTANT: Sure, I am here to help you out. Joseph Martin, we regret to inform you that there is no reservation found on your name in our records.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for choosing us.