Hello. I am Kevin Lee.
Hello, how can I assist you today?
last week I was going to attend, a dinner hosted by President Trump. But the dates have been changed. So, please cancel my reservation.
Sure, please wait for a moment. I will check the availability of reservation  on your name and revert you. Thank you for waiting, we found a reservation on your name, shall I proceed for cancellation?
Yes, please.
Thank you for choosing us, your ticket has been cancelled.