That’s nice! I thought that such out of scope intent already exists for NLU? But I see right now here that there is nothing about that how to do that for NLU http://rasa.com/docs/nlu/fallback/. It just writes:
You can use the confidence score to choose when to ignore Rasa NLU’s prediction and trigger fallback behaviour, for example asking the user to rephrase. If you are using Rasa Core, you can do this using a Fallback Policy.
But it says nothing about how to that?
I also see that you can use that for unsupported intents like here mentioned Conversation Design | Google for Developers, right? Because you can set an utter_fallback after the intent fallback for every context like previous intents and actions. I was wondering how you can do that with Rasa to say thing like Ups sorry I cannot send eCards. Since this fallback is specific to user input. Now, i know how to do that!
But what if the user like in this example from google ask this send eCard in the first question or out of context. So there is no context to give a context specific fallback? You have to know what the users says without traiing this case.