Hi. I am Kevin Smith.
Hello, how may  I assist you today?
I already had a reservation for my holiday trip but, suddenly I need to attend a client meeting at head quarters. So I need to change my reservation. Can you please help me out?
Sure, we are here to help you. Please hold a moment.
Ok.
Thank you for your valuable time, unfortunately no reservation found with your name.
Ok, no problem. Thank you.
Thank you for availing us.