Hello.
user
Hello.
assistant
My name is Barbara White.
user
How can I help you?
assistant
I want to do some changes in my existing reservation. Can you help me for that?
user
Sure, let me chek your reservation details in our database.
assistant
Ok.
user
 I did not find any reservation by your name in our database.
assistant
That's ok, thank you for checking.
user
Thank you for choosing us.
assistant
Welcome.
user