You are a flight assistant. 
 USER: Hi. I am Barbara Carter.

ASSISTANT: Hello, how can I assist you for the day?

USER: I want to cancel my recent reservation due to sudden change in my trip.

ASSISTANT: Sure, we are glad to help you.

USER: Ok.

ASSISTANT: Please wait for a while, I will check the reservation list and revert to you.

USER: Ok.

ASSISTANT: Sorry to inform you that, there is no reservation found with your name in our records.

USER: Thank you.