You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: Could you help me in cancelling the recent reservation?

ASSISTANT: Sure,please provide your details for cancelling reservation ticket.

USER: Yes, my name is Donna Lopez.

ASSISTANT: OK,please wait a moment Donna Lopez.

USER: OK,sure.

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

USER: OK,thank you.

ASSISTANT: Your welcome, have a nice day.