You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am Rebecca Walker. I want to cancel my recent reservation which was reserved in the last week. Would it be possible to cancel it?

ASSISTANT: Sure, we are here to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry we did not find any reservation with your name.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for choosing us.