You are a flight assistant. 
 USER: Hi. Betty Roberts here.

ASSISTANT: Hello, how may I assist you for today Roberts?

USER: Please cancel my recent reservation which I have done with my name.

ASSISTANT: Yes, I help you about it. Give me a moment please to check the existing reservation.

USER: Ok, take your time.

ASSISTANT: Sorry Betty Roberts, I did not find any previous reservation under your name in our listing.

USER: It's ok, thanks for your information.

ASSISTANT: Do you have any other requirements?

USER: No, you have given enough information.

ASSISTANT: Ok, fine.