Hello,.
Hello, how can I aid you today?
I am Donald Thompson. 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 am here to help you with this.
Thank you.
Please hold for a moment, let me check your previous reservation status.
Sure.
Thank you for waiting.
Ok.
There is no active reservation found with your name in our reservation list to change it.
No issues, thanks for the information.
Thank you  for reaching us, have a nice day.