Hi.
Hello, how can I amend you today?
I am Sarah Edwards. Owing an emergency want  to cancel my reservation, can you please help me with it?
Sure, we are gleeful to help you in cancellation. Please wait for a while, I will check the reservation list and revert to you.
Ok.
Thank you for waiting. We are sorry to inform you that, there is no reservation found with your name.
That's ok, thank you for the information.
Thank you for choosing us. Have a good day.