Hi.
Hello, how can I aid you today?
I want to cancel my recent reservation due to sudden cancellation  of my trip. Can you help me?
Sure, we are glad to assist you in that.
Thank you.
Before cancelling your previous flight reservation. May I know your name?
Larry Brown here.
Sorry Larry Brown, based on your name we haven't found any flight reservation to cancel in airline database.
That's Fine, Thank you for the information.
Thanks for reaching us.