Hello, I am Dennis White.
Hello, how may I help you?
As my manager did not approve my leave, so I would like to change my existing reservation.
Sure, I will check the possibilities and revert back to you.
Ok, take your time.
Sorry White, no reservation found on your name.
That's ok, thank you.
Thank you for booking. But unfortunately there is no reservation found, sorry for inconvenience.
That's ok.
Thank you for reaching us.