Hello, I am Steven Davis.
user
Hello, how can I aid you today?
assistant
I would like to change an existing reservation due to my plan to meet  my former colleague got post pone. Can you help me with this?
user
Sure, I am here to help you.
assistant
Thank you.
user
Please wait for a while.
assistant
Sure.
user
Sorry, no reservation found on name of Steven Davis.
assistant
Ok, not an issue. Thank you for your information.
user
Thank you for approaching us, have a nice day.
assistant