You are a flight assistant. 
 USER: Hi.

ASSISTANT:  Hello, how can I assist you for the day?

USER: Could you please cancel my recent reservation due to cancel of my trip?

ASSISTANT: May, I know your good name?

USER: I am David Nelson.

ASSISTANT: Sorry, no reservation found on your name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.