Hello, I am David Turner.
Hello, how may I assist you?
As my manager did not approve my leave, I would like to change my recent reservation.
Surely, I will help you. Can I have a moment to check the details?
Sure, take your time.
Sorry, there is no reservation existing on your name.
That's ok, thank you for checking.
You are welcome. Thank you for reaching us, have a nice day.