elif agent_type == AgentType.OPENAI_FUNCTIONS:
        system_message = SystemMessage(content=prefix)
        _prompt = OpenAIFunctionsAgent.create_prompt(system_message=system_message)
        agent = OpenAIFunctionsAgent(
            llm=llm,
            prompt=_prompt,
            tools=tools,
            callback_manager=callback_manager,
            **kwargs,
        )
    else:
        raise ValueError(f"Agent type {agent_type} not supported at the moment.")
    return AgentExecutor.from_agent_and_tools(
        agent=agent,
        tools=tools,
        callback_manager=callback_manager,
        verbose=verbose,
        **(agent_executor_kwargs or {}),
    )