developers.home-assistant/docs/intent_conversation.md

title
Registering sentences

The conversation component handles incoming commands from the frontend and converts them to intents. It does this based on registered sentences.

As a component, you can register sentences with the conversation component to allow it to be remote controlled. Refer to named slots by putting the slot name between curly braces: {item}. Use square brackets around (partial) words to mark them as optional.

Example code:

async def async_setup(hass, config):
    hass.components.conversation.async_register('MyCoolIntent', [
        'I think that {object} is [very] cool',
        'Nothing is cooler than {object}'
    ])

If a sentence like "I think that beer is cool" comes in, the conversation component will generate an intent of type MyCoolIntent and with 1 slot, named object and value beer.