How to make it so that I don't have to type in the whole name?

I'm using a script that when you say the keyword (ring/), you have to type in the persons whole name and they'll be teleported to the ring if the person saying it is an admin. I'm trying to figure out an edit I can make so that I don't have to type in the persons full name, but I can't figure it out. I did not write this, but I am using it, seeing as it's a utility a lot of other people use.

print("teleport") 

jail = script.Parent 

permission = { "CrazedAce" }  --Place Admins Here


function check(name) 
if table.maxn(permission) == 0 then return true end --If table contains no values, returns true 
for i = 1,#permission do 
if (string.upper(name) == string.upper(permission[i])) then return true end 
end 
return false 
end 

function Jail(name) 
local player = game.Players:FindFirstChild(name) 
local torso = player.Character:FindFirstChild("Torso") 
if torso == nil then return end 
local location = {jail.Position} 
local i = 1 

local x = location[i].x 
local y = location[i].y 
local z = location[i].z 

x = x + math.random(-1, 1) 
z = z + math.random(-1, 1) 
y = y + math.random(2, 3) 

local cf = torso.CFrame 
local lx = 0 
local ly = y 
local lz = 0 

torso.CFrame = CFrame.new(Vector3.new(x,y,z), Vector3.new(lx,ly,lz)) 
end 

function onChatted(msg, recipient, speaker) 

-- convert to all lower case 

local source = string.lower(speaker.Name) 
msg = string.lower(msg) 

if not check(source) then return end 

if string.match(msg, "bs") then --change Tele to what ever u want to say before the name
local players=game.Players:GetChildren() 
for i=1, #players do 
if string.match(msg, string.lower(players[i].Name)) then 
Jail(players[i].Name) 
return 
end 
end 
end 
end 

function onPlayerEntered(newPlayer) 
newPlayer.Chatted:connect(function(msg, recipient) onChatted(msg, recipient, newPlayer) end) 
end 

game.Players.ChildAdded:connect(onPlayerEntered)

I believe I have to edit something after the comment about string conversion, but I'm not sure. Please help.

If you want to check if a player's name starts with a certain substring then you need to check if the substrings are equal:

function FindPlayers(str)
	local t={}
	for _,v in pairs(game.Players:GetPlayers())do
		if v.Name:lower():sub(1,#str)==str:lower()then
			t[#t+1]=v
		end
	end
	return t
end