Hello.
Hello, how can I  aid you today?
I want to change my reservation due to some personal work, can you please help me with it?
Sure, I am ready to help you. May I know your name please?
I am George White.
OK, please hold on I will check and get back to you.
Sure.
Thanks for waiting. Sorry say to you there is no reservation found with your specification.
Its ok, thank you.
Thank you for choosing us, have a great day.