Hello.
Hello, how may I provide assistance to you?
Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?
 Sure, I can change your reservation right now. Before that I need to know your good name please?
I am Mark Smith.
Thank you. Please stay online for a while, I will check your reservation status and let you know.
Sure.
I have checked in reservation list to change your ticket, but could not find any reservation with your name.
No problem, thank you for the information.
Thank you for availing us.