Until now, we have dealt with interpreting the user's request; now it is a matter of answering. In reality, the concept is broader; once we have understood a request, we can fulfill it, for example, by booking the room, opening a ticket, or communicating with the restaurant. But if what we are making is a chatbot, the answer will probably correspond to the action.
An action corresponds to the step your application will take when a specific intent has been triggered by a user's input. Both the action name and its parameters are defined in the action section of an intent.