Hello.
user
Hello, how may I be at your service 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
May I know your name please?
assistant
I am Donna Taylor.
user
 Sorry, there is no reservation matching with your name in our portal to make changes further.
assistant
No problem, thanks for the information.
user
Thank you for choosing us.
assistant