Design a Multi-Agent Chat for Complex Request Handling

Expand the AutoGen setup to handle a complex, multi-step user request (e.g., 'Find me a vegetarian recipe for dinner tonight, considering I prefer low-carb options, and then add the ingredients to my shopping list.'). Design the agent roles (e.g., `RecipeFinder`, `ShoppingListManager`) and their communication flow within a `GroupChat` and `GroupChatManager` to fulfill this request. Show how these agents would dynamically use tools (even if simulated).