You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name?

USER: My name is David Smith.

ASSISTANT: How can I assist you David?

USER: I want to cancel my reservation due to cancel of my conference in Wipro.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a reservation with your name. Shall I proceed to cancellation?

USER: You can proceed to cancellation.

ASSISTANT: Your reservation has been successfully cancelled.

USER: Thanks for your good service.

ASSISTANT: Thanks for opting us. Have a nice day.