Hello.
 Hello, How exactly I can serve you the best today?
I want to change my existing reservation due to sudden change in trip dates. Can you help me with that?
Sure, I will help you with that.
Thank you.
Let me know your name to check your reservation?
I am George Phillips.
Ok, please wait a moment.
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, no worries at all. Thank you.
Thank you for choosing us.