The process of creating a simulation model, in particular using the System Dynamics methodology, is a complex and time-intensive task. It begins with a clear understanding of the problem, followed by the identification of key variables, and culminates in the construction of a Stock and Flow Diagram (SFD). Traditionally, this process has been laborious, requiring significant manual effort to translate a conceptual understanding into a functional model. With the advent of advanced AI tools like ChatGPT, this process can be significantly streamlined. This paper presents a personalized ChatGPT prompt, DAVID© (Draw A Vensim Initial Draft) that can automate the creation of a complete Vensim model, from problem description to a fully functional simulation.