Hello.
user
Hello, how may i assist you?
assistant
My name is Karen Davis. I want to change my existing reservation due to sudden change in my destination. Can you help me in changing reservation?
user
Sure, I will help you. Please wait for a  minute, I will revert you with current status.
assistant
Sure.
user
unfortunately there is no reservation found with your name.
assistant
Ok, Not an issue. Thanks for the information.
user
Thank you for reaching us.
assistant