Hi.
Hello. How can I help you today?
I need to change my existing reservation, Can you please help me with that?
Sure, I am here to help you.
Thank you.
 I need some basic information to check your ticket details, can you please tell me your full name?
Paul Adams here.
Ok, please wait a minute I will get back to you with the present status.
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 problem. Thanks for your information.
Thank you for approaching us.