Intent: It signifies what the user wants to accomplish. Ex: I want to book a flight.
Entities: It's a variable that complements the intent. Ex: I want to book a flight from Montreal to Paris / Cities are entities because they are variables that can be extracted from the intent.
Slots: When you create an intent, you can tag different slots that can be used to extract information required to act on the intent successfully. Ex: I want to book a flight from New York to San Francisco for tomorrow. Your slots are the departing city, New York, the arrival city, San Francisco and the date of departure, tomorrow.
Utterances: They represent the different ways an intent can be written by a user. It can take the form of a question, a command or a statement. Ex:
Can you book me a flight?
Book flight.
I want to book a flight.
Flow: A series of logical steps put together to help a user to accomplish a goal.
Node: A step in a flow. They can be used to say something, to execute an action, to transition based on conditions, and more.
Start Node: The node where the flow begins. It's the first step of a user.
On enter: This is what happens when the user enters a node.
Transition: This is composed of a condition and an action to be executed if the condition is met.
On receive: Action that happens after the user has said something
