Integrate Human-in-the-Loop Feedback

Modify your AutoGen workflow to include a human-in-the-loop step after the initial plan generation. The `UserProxyAgent` should present the plan to the user for feedback. Based on this feedback, the agents should automatically re-engage to revise the plan, demonstrating an iterative improvement loop. Provide Python code for this feedback loop and demonstrate how agents respond to negative and positive feedback scenarios, leading to the `HumanInLoopValidationResponse`.