You are  going to build your first AI agent.    We start off using a chat input trigger for the agent.    And then, we add an AI Agent node, connecting our LLM as being  ChatGPT.    We give the agent some memory through a simple memory node.    And then, we generate a prompt depending on our use case, and paste it into  the System prompt area in the n8n agent.    We add a tool, Google Sheet, so it can log all of our positive  replies.