Hello,. I am Jeffrey Lee.
Hello, how may I oblige you today?
My meeting got postponed as of now, so I need to change my existing reservation. Please help me out.
Sure, I am faithful to help you. Please wait a while, I will search on the reservation list and  get back to you.
Ok.
Thanks for waiting, no reservation was found on your name.
No problem, thanks for the information.
Thank you for choosing us.