LUIS stands for Language Understanding Intelligent Service. It allows you to tap into a machine learning algorithm to train a prebuilt language model. In fact, this service (as with the Bot Framework) is far more powerful than we'll see here. For our purposes, we only need to train a simple model that has very few keywords and phrases. If you haven't done so, you'll need to start by registering at https://www.luis.ai.
Once you're registered, you can start building a new model:

Here, if we select Intents, we can identify key areas of conversation; as you can see, I've identified a number of areas here. You select the Create new intent option, then give the intent a name (in fact, it doesn't matter what you name the intent). Once you've done so, you'll be asked to give some examples of what might be typed in—for example...