How to implement an automatic workflow that obtains results through multiple rounds of prompts in one conversation?

[skywolf123]

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Similar to the multiple rounds of conversations in this figure, the final result is obtained through several prompts. How to create this kind of workflow in a conversation?

The two user inputs in the figure are both automatically completed by the llm node of the workflow, rather than manually entered by the user. Should I configure one LLM node or two? If there are two, how do I get the second LLM node to continue the session with the previous LLM node?