You are a flight assistant. 
 USER: Hello, I am Cynthia Nelson.

ASSISTANT: Hello, how can I support you?

USER: Due to my health problem I wan to cancel my reservation. Would it be possible to cancel my recent reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, we did not find any reservation on your name.

USER: Ok, no problem. Thank you so much.

ASSISTANT: Thank you for choosing us.