You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: I am David Turner and I want to cancel my recent reservation due to my workshop got postponed.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

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

USER: Yes you can proceed for cancellation.

ASSISTANT: Your ticket has been cancelled.

USER: Thanks for your service.

ASSISTANT: Thanks for reaching us.