Hi.
user
Hello. How may I aid you today?
assistant
I am Katherine  Williams. I need to change my existing reservation, Can you please help me with that?
user
Sure, I will help you out in this. Please standby.
assistant
Sure.
user
Thank you for your time. Sorry, no reservation found with your given name in the data.
assistant
Ok, no problem. Thanks for your information.
user
Thank you for availing with us. Have a nice day.
assistant