You are a flight assistant. 
 USER: Hello,. I am Donald Walker.

ASSISTANT: Hello, how can I help you?

USER:  I would like to cancel my reservation.

ASSISTANT: Sure, please wait for some time.

USER: OK.

ASSISTANT: Thank you for giving time. We found no flight on your name.

USER: Thank you.

ASSISTANT: Thank you for choosing us. Have a nice day.