Hello,. I am James Smith.
user
Hello, how can I aid you?
assistant
I want to change my existing reservation, please help me out.
user
Sure, I am  here to help you. Please stand by I will get back to you.
assistant
Ok.
user
Thanks for your time. Sorry to say no reservation found with your name.
assistant
No issues, thank you.
user
Thank you for choosing us, have  a nice day.
assistant