Whenever the system receives a trigger it cannot match it will be triggered. You can use this for fallback scenarios.
Our AI system learns based on the examples you train for each step. It also works the other way around. You can teach the AI what it should not match. This is especially useful in delicate situations like customer support.
Unknown triggers can be placed within context of a flow. That way you can easily differentiate the reply actions based on the context of a flow.
Note that the unknown is also triggered when a user for example shares an image and you do not have a flow handling this specific situation.