Need help in building the graph

[Laxmi530]

Hi,
I'm new to LangGraph and currently exploring it for a personal project. While following the documentation, I've completed most parts, such as human_input and route_after_node, but I'm a bit stuck on how to properly build the graph.
Below is the expected graph.

The graph I'm aiming to create involves three human inputs between node_1 and node_4. The decisions within the graph should be made based solely on the node outputs, with human inputs included only for user reference.

Below is a sample of the code I'm working with:

def route_after_node_1(state: TestGraphState):
    """Routes based on response."""
    print("---Routing node_2---")
    if state.get("user_files"):
        print("Decision: Files found, proceed to extract content.")
        return "node_2"
    else:
        print("Decision: No files found, end process.")
        return "final_message"

def human_approval_1(state: TestGraphState) -> Command[Literal["node_2"]]:
    is_approved = interrupt(
        {
            "question": "Is this correct?",
            "files": state["user_files"]
        }
    )
    if is_approved:
        return Command(goto="node_2")
    else:
        # state["closing_message"] = "Unable to find files. Please check the user's name in the query."
        return Command(goto="final_message")

builder = StateGraph(TestGraphState)
builder.add_node("initial_node", initial_node)
builder.add_node("node_1", node_1)
builder.add_node("human_approval_1", human_approval_1)
builder.add_node("node_2", node_2)
# builder.add_node("human_approval_2", human_approval_2)
# builder.add_node("node_3", node_3)
# builder.add_node("human_approval_3", human_approval_3)
# builder.add_node("node_4", node_4)
builder.add_node("final_message", final_message)

builder.add_edge(START, "initial_node")
builder.add_edge("initial_node", "node_1")

builder.add_conditional_edges("node_1", route_after_node_1, path_map=["final_message", END])
# builder.add_conditional_edges("node_1", route_after_node_1)
# builder.add_conditional_edges("node_2", route_after_node_2)

# builder.add_edge("node_1", "human_approval_1")
# builder.add_edge("human_approval_1", "node_2")
# builder.add_edge("node_2", "human_approval_2")
# builder.add_edge("human_approval_2", "node_3")
# builder.add_edge("node_3", "human_approval_3")
# builder.add_edge("human_approval_3", "final_message")

builder.add_edge("final_message", END)

# builder.add_edge("node_1", "human_approval_1")
# builder.add_edge("human_approval_1", "node_2")
# builder.add_edge("node_2", "human_approval_2")
# builder.add_edge("human_approval_2", "node_3")
# builder.add_edge("node_3", "human_approval_3")
# builder.add_edge("human_approval_3", END)

memory = MemorySaver()
graph = builder.compile(checkpointer=memory)

Any guidance or suggestions would be greatly appreciated.
Thank you for your time and support.

Best regards,
Laxmidhar