Hello.
Hello,  how may I help you today?
I want to change my reservation, can you help me with that?
Sure, I will help you with that. May I know your good name?
Paul Brown here.
Please wait for a moment, while I search for your reservation.
Sure.
Thank you for waiting, sorry there is no reservation found on your name in our system data to change it.
No problem, thank you for the information.
Thank you for visiting us, have a nice day ahead.