You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Jack Lee. I need to cancel my recent reservation, as I need to stay back in my city due to illness. Could you help me in cancelling my recent reservation.

ASSISTANT: Sure, please wait a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation on your name.

USER: Ok, thank you for your service.

ASSISTANT: Thanks for choosing us.