Hello, I am Kenneth Jones.
Hello, how may I help you at this moment?
As my manager did not approve my leave, I would like to change my recent reservation.
Sure, I will help you. Please wait for a moment, I will check the availability.
Sure, take your time.
Sorry, there is no reservation available on your dates.
That's ok, thank you for checking.
You are welcome. Thank you for reaching us, have a nice day.