Hi.
 Hello, how can I assist you today?
I would like to change my existing reservation. Can you please assist me in this?
Sure, I will help you with that.
Thank you.
May I know your name to check your details in our database?
I am James Walker.
Please wait a while.
Ok.
Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.
It's ok, not an issue. Thank you for your information.
Thank you for choosing us.