You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Due to a sudden change in plan, I would like to cancel my current reservation. Please help me in cancelling my reservation.

ASSISTANT: Ok, may I know your name?

USER: My name is Benjamin Davis.

ASSISTANT: Ok, there is no reservation found you.

USER: Thank you for the information.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: You are welcome.