You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is Dorothy Clark. Actually I booked a ticket to attend a music concert in NYC, but due to personal problems, I want to cancel my trip.

ASSISTANT: Ok Dorothy, so do you want me to cancel your existing reservation?

USER: Yes, please help me out.

ASSISTANT: Ok, please hold on for a moment so that I can check the details of your existing reservation.

USER: Sure, take your time.

ASSISTANT: I have found your reservation with your name, shall I proceed with the cancellation?

USER: Please proceed.

ASSISTANT: Ok, your reservation has been cancelled.

USER: Thank you for helping me out.

ASSISTANT: Thank you, have a nice day.