I have a bot that answers question related to a certain topic. However, the user may say something that doesn't match with any intent I have. This phrases need to be stored on a database.
So far, I found out that I need to create a fallback intent. How can I make it so upon being triggered this intent returns a response with the text that triggered the intent?
Also, if I only have one fallback intent, will every missed match trigger it or do I have to link it in some way to all my intents?
The easiest way to do something with the user input in a Fallback Intent is through your fulfillment webhook. In the request object that is sent, you can look at the queryResult.queryText parameter to get the text from the user. You can then send this as part of your response as part of the fulfillmentMessages object.
You can't "attach" a Fallback Intent to a regular Intent. That doesn't actually make sense, since Intents represent what a user says, rather than the state of the conversation.
While there is a single Fallback Intent available, which can catch all no-match phrases, it is also possible to create Fallback Intents that only trigger if specific input contexts are set. If you have regular Intents with these same input contexts set, then the Fallback Intent with the context would catch anything they don't.