Hi,.
Hello, how can I aid you?
I would like to cancel my recent reservation, As my manager did not approved my leave on my travel date. Can you please cancel my reservation?
Sure, may I know your good name please?
Kenneth Smith is my name.
Ok, please wait a while.
Sure.
Thank you for waiting. Unfortunately we didn't found any  reservation with your name.
Ok, not an issue now. Thank you for the quick response, I am really happy with that.
Thank you for reaching us.