Is there a way to have an NPC say a separate dialog if the player has a tool?

I want to make a NPC using the Dialog object (If possible) that if you have a certain tool the NPC says one thing but if you don't have the tool says another thing. I have tried lots of things but nothing seems to work. The script is located inside of a bunch of models and folders in workspace. The script is NOT a module or local script.

Here is what I tried:

local Tool = game.Players.LocalPlayer.Backpack:GetChildren() --[[ Creates a table of all the objects inside the players backpack]]--

-- Creates a function that checks if the player has of does not have the tool
local function dialog()
-- Loops around the players backpack
    for i, v in pairs(Tool) do
        print(v)

        -- Checks if v is == the tool (The tool is named "Artifact")
        if v.Name == "Artifact" and v:IsA("Tool") then
            print("You have the tool")
            -- Changes the dialog 
            script.Parent.InitialPrompt = "You found it! Take it to the gate to open it."
        else 
            -- Changes the dialog if the player does not have the tool
            script.Parent.InitialPrompt = "I don't see an artifact! You need the artifact to get in!"
        end
    end

end

-- Checks if the dialog is in use. If it is then the function above will run
if script.Parent.InUse == true then
    dialog()
end

I don't know if this is possible without coding my own dialog system but if there is a way then please help!

Any help appreciated! Thanks!