Hi. I am Kevin Johnson.
user
Hello, how may I be of your help today?
assistant
 Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?
user
Sure, please wait.
assistant
Ok.
user
I have checked in reservation list to change your reservation, but could not find any reservation with your name.
assistant
It's Ok, thanks for your response.
user
Have a good day.
assistant