Hello.
Hello, how can I assist you today?
Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?
Sure, I will help you with that.
Thank you.
May I know your name to check your details in our database?
Reservation was made by Patrick Nelson.
Please wait for a while, to check the present status of your earlier reservation and let you know.
Ok.
Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.
No problem, thank you for your information.
Thank you for availing us. Have  a blissful day!.