Setup OpenAI Agent with Core Tools

Initialize your OpenAI Assistant (Agent) using the OpenAI Assistants API. Define a set of initial tools that the agent can use. These should include a custom 'retrieve_user_profile' function (simulating Featuretools output) and a 'knowledge_base_lookup' function. Use `gpt-4o` as the underlying model. Provide Python code for agent initialization and tool definition.