Hi.
Hello, how may I serve you today?
I made a reservation earlier for early morning flight now I want to modify it for afternoon flight. Can you do this for me?
Sure, we are here to help you.
Thanks.
Can I have your name to proceed further?
Sure, my name is Larry Smith.
Ok, please hold a moment.
Sure.
Thank you for your time, sorry, no reservation found with provided name.
Not a problem, leave it. Thanks for the information.
Thank you for  approaching us.