You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I just want to cancel my recent reservation.

ASSISTANT: Ok, may I know your name please?

USER: Myself Cynthia Miller.

ASSISTANT: Ok, wait a moment. Sorry, there is no reservation has been found.

USER: Ok, thanks for checking.

ASSISTANT: Thank you for choosing us.