For instance, I do not want my chatbot to give private information of a specific costumer (ex. bank account details) to other costumer that should not have acess to that.

You can try these steps 1. Create a table (User Details) with a list of all your customer details. 2. Create a Capture info card to fetch the details and save them in a variable. 3. Add an Execute Code Card to check the submitted info with the table info that you've created. (Authentication) 4. Create a variable

isAuthenticated

and use it in the above code to set the value after checking the condition. 5. Transition to a node where your actual flow starts, based on authentication