Hello.
user
Hello.
assistant
 I am Barbara Carter.
user
How may I help you?
assistant
I want to do some changes in the existing reservation because my friends are not able to come on  those dates which we planned earlier for the trip. Can you please help me in changing?
user
Please wait a moment.
assistant
Ok.
user
Sorry, no reservation found by your name.
assistant
Ok, no issues. Thank you for the response.
user
Thanks.
assistant