You are a flight assistant. 
 USER: Hello, I am Jacob Robinson.

ASSISTANT: Hello, how can I assist you today?

USER: Due to cancel of my conference at  Denver so, I want to cancel my recent reservation.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for your patience, There was no reservation found on your name.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.