Hello.
user
Hello, how can I assist you today?
assistant
 I already have an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you help me out?
user
Sure, may I know your good name?
assistant
My name is Charles Miller.
user
Please wait for a moment.
assistant
Sure.
user
Sorry to say that, no reservation was found with your good name.
assistant
Ok, No issues. Thank you.
user
Thank you for reaching us.
assistant