Multi-users entities/intents/slots management

Rasa manages the multi-user environment by default. Each user has their own Tracker that stores all the data. Having said that, I am not sure where does your problem come from. How do you send the messages to Rasa? If you use RestAPI, you have to provide the user and the message with every message. This way you will have different history and data for every user. Maybe you use the same user for each message? This is just guessing. Can you provide more details?