Rasa NLU does not have any context. You can’t make any context aware intent recognition. At least not without a detour (Providing conversation context to the NLU using microservices). I really hope Rasa will introduce such a feature soon.
Rasa Core helps you to design the “dynamic decision tree”, but it is not an alternative to the Dialogflow Context (Context-aware Dialogue — Rasa NLU 0.12.3 documentation).