How can I make a block change colour by saying a word?

****Hello! Me and my friend were making a script for a part to change colour when a custom word is said. We came up with this and does not work. How could we fix this? The part(s) is a gem on a gauntlet - like the infinity gauntlet however different colours and the gems are supposed to be swapping colours. If you can assist us with this, it'd be very appreciated.****

admins = {"Starlighxt","pompintrere"}

function isAdmin(name) 
for i,v in pairs(admins) do 
if name:lower() == v:lower() then return true end 
end 
return false 
end 

game.Players.PlayerAdded:connect(function(p) 
if isAdmin(p.Name) then 
p.Chatted:connect(function(msg) 
if msg=="change" then 
    local peep = workspace:FindFirstChild(p.Name)
    local Gauntlet = peep:WaitForChild("Gauntlet")
for i, v in pairs(Gauntlet:GetChildren()) do
    if v.Name == "Gaun" then
        v.Color = Color3.fromRGB(0,255,0)
    end
end
wait(5) 
for i, v in pairs(Gauntlet:GetChildren()) do
    if v.Name == "Gem" then
        v.Color = Color3.fromRGB(0,0,0)
    end
end
end 
end) 
end 
end)