Hello. I am David Walker.
Hello, how may I oblige you today?
My meeting at my office got preponed, will you help me to change my existing reservation?
Sure, I will help you with that. Please wait a while.
Sure.
Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.
Ok, not an issue. Thank you.
Thank you for approaching us.