You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I help you?

USER: I am Barbara Walker.I  need to cancel my recent reservation.

ASSISTANT: OK, please wait for a minute so that I will check with the previous reservation and let you know.

USER: OK.

ASSISTANT: Sorry, there is no  reservation  with your name.

USER: OK. Thanks for your information.

ASSISTANT: Thank you. Have a great day.