Hello.
Hello, how may I aid you?
I want to change my existing reservation, can you please help me with this?
 I am here to help you with your concern. May I know your name please?
I am Gregory Collins.
Wait a moment.
Sure,.
Thank you for waiting, there is no reservation found for the user name in our data base to change your previous booking.
No problem, thanks for your information.
Thank you for availing us.