Hi,.
user
Hello,.
assistant
I am Robert Williams.
user
 How may I be of your service today?
assistant
I want to change my reservation, can you help me with that?
user
 Sure, I can help you in that.
assistant
Thank you.
user
 Please wait, Let me check your reservation status?
assistant
Ok.
user
Thanks for your time. Sorry. There is no active reservation on your name to change it.
assistant
Ok, thanks for the information.
user
Thanks for approaching us.
assistant