'Website user friendly. Like the email follow ups and prompt service.'
'You were great and the flowers made my sister lift her mood. Thank you for sending them to the house instead of the Hospital. You get a double A+ in my book.'
'Great service. Easy website to navigate. I am very impressed with the updates and information as to the status of my order. Thank you very much.'
You won't be able to dismiss this by usual means (escape or click button), but you can close it programatically based on user choices or actions.