Hello.
Hello, how may I oblige you today?
Can you please change my reservation due to postpone of joining in an organisation?
Sure,  I am here to assist you. To proceed further, may I know your good name?
Christine Campbell is my name.
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 issues. Thanks for your service.
Thank you for reaching us, Have a great day!.