Hello.
Hello. How may I be of your assistance?
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, we are here to help you in changing an existing reservation.
Thank you.
 I need some basic information to check your ticket details, can you please tell me your full name?
I am John Evans.
Ok, please wait a minute I will get back to you with the present status.
Sure.
I have checked in reservation list to change your ticket, but could not find any reservation with your name.
Ok, no problem. Thanks for the information.
Thank you for approaching us.