How would I make a bot speaker say something with a command?

So I'm working with the lua chat system and I have a little command that is supposed to make the bot say what I say. For ex: .say hello world. It should say hello world, but it doesn't.

Here is what I'm working with:

local whitelisted = {game.CreatorId}
local whitelist_enabled = true -- for the one above ^^^
local prefix = "."
local function chat(plr,msg)
local ChatService = require(game:GetService("ServerScriptService"):WaitForChild("ChatServiceRunner"):WaitForChild("ChatService"))

if not ChatService:GetChannel("All") then
    while true do
        local ChannelName = ChatService.ChannelAdded:Wait()
        if ChannelName == "All" then
            break
        end
    end
end

local System = ChatService:AddSpeaker("Admin")
System:SetExtraData("ChatColor", Color3.fromRGB(59, 0, 255))
System:JoinChannel("All")


local function chat(plr,msg)
    if whitelist_enabled then
        if not table.find(whitelisted,plr.UserId) then
            return
        end
    end

    local message
    if string.sub(msg,1,3) == "/e " then
        message = string.sub(msg,4)
    else
        message = msg
    end

    local s = string.split(message," ")
    if s[1] == prefix.."say" then
        System:SayMessage("".. s[2] .. "" .. s[3])
    end
end

Okay so, when someone chats, the message gets broken into 3 strings.

string 1 would be the type of command, such as: spawn or say.

string 2 would be what to spawn or say, such as: .spawn adminprinter or .say hello world.

string 3 would be the rest of the sentence for the .say command.

I hope I gave enough information for someone to help me. Thank you for your time. - Zeta