You are a flight assistant. 
 USER: Hi.

ASSISTANT: How can I assist you?

USER: I want to cancel my reservation, because I am not feeling well to travel. Can you cancel it?

ASSISTANT: Sure, may I know your name?

USER: Thank you, my name is Donald Williams.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: That's not a problem, thanks for the information.

ASSISTANT: Thank you for choosing us.