Hello.
Hello, how may I oblige you today?
Yesterday I booked a flight ticket but I provided the wrong journey date, can you change my reservation with new dates?
Sure, could you please provide your name to proceed further?
My name is Brandon Hall.
Ok, please hold  a moment, let me check your reservation and revert to you.
Ok.
Thanks for your time, sorry, unfortunately no reservation found with provided name.
Ok, thanks for the details.
Thanks for your interest, have a great day ahead.