For several years now, we have known how to create chats between two human users. With the advent of LLMs, we are led to design these same chats but between a human and an LLM. Let's see together how to leverage proven software components, combined with recent AI technologies, to create a real-time chat between a human user and an LLM. On the technical agenda: Symfony AI, Mercure, and SSE client in PHP.