You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I would like to cancel my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure, I am here to help you. May I know on whose name you have booked the ticket formerly?

USER: I am Barbara Smith.

ASSISTANT: I found a reservation on your name, shall I proceed to cancel?

USER: Please proceed to cancel.

ASSISTANT: Your ticket has been cancelled.

USER: Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.