Method and system for generating user interactions in a flow-based engine during the execution of a synchronous flow which potentially represent the logic for handling another user interaction. The method encapsulates and hides the asynchronous nature of the user interaction, thus enabling the author of the business flow to use the user interaction as a single synchronous action oblivious to the underlying asynchronous implementation, said method comprising of the steps: defining user interactions action in a business flow diagram as an atomic action; translating said flow into executable form; executing said flow, presenting said UI to end-user as a replacement to the original UI response for which the flow was invoked; receiving end-user response; resuming said flow and using said response in subsequent flow commands and continuing the original user interaction session.