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