Hello.
Hello, How exactly I can serve you the best 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?
Let me know your name to check your reservation?
I am Andrew Campbell.
I have checked in reservation list to change your ticket, but could not find any reservation with your name.
 Not a problem, thank you for the information.
Thank you for reaching us.