Hello,.
Hello, how may I oblige you today?
I want to change my existing reservation which is reserved earlier on my name. Can you help me?
Sure, I will help you with that.
Thank you.
May I know your name to check your details in our database?
Nancy Hall, is my name.
Please wait for a while, to check the present status of your earlier reservation and let you know.
Sure, I will wait.
 Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.
Ok, not an issue, May be I reserved with another airline. Thank you for the help.
Thank you for reaching us, Have a blissful day!.