ML + rule-based chat-bots on RASA - is it possible?

Getting Started with Rasa
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Hi there, I have a question, possibly to simple for RASA experts, anyhow… many industry-level chat-bots use rules to keep strict behaviour. From another point of view, ML provides much of flexiblity and new features; is it possible to gain both approaches from RAS?

Thanks in advance! Mike

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FormAction is created to introduce rule based strict behavior that works together with ML. If rules cannot determine the next action, rasa_core will automatically switch to ML policy