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