Description of the illustration message_validation.png

This is a runtime image of the CrcPizzaBot. This image shows a series of message. In the first, the bot outputs a message (What size do you want?) with a list of options (small, medium, large). The user’s response message, “groot” then prompts the bot to output the “size” message again, but this time, the message is: “Invalid size, please try again. What size do you want?” The next message from user is medium, a value from the list, so the bot moves to the next state using the message, “To which location do you want the pizza delivered.”