Hello.
user
Hello. How can I assist you?
assistant
 I am Karen Smith want to change my reservation due to prepone of my meeting. Can you help me in changing?
user
Yes, I can help you. Give me a moment.
assistant
 Ok.
user
Sorry to inform you that there is no reservation found on your name.
assistant
Thank you for your help.
user
Thank you for consulting us.
assistant