How can I do this?

I'm trying to make a script that a model replies to a player when a player says something that has a certain keyword before, after, or both. Is it possible to do it that way?

local PlayerKeywords1 = {
	"yo",
	"ye",
	"hello",
	"hi",
	"wassup",
	"sup",
	"hellur",
	"ni hao",
	"hola",
	"hai"	
}
local PlayerKeywords2 = {
	"good",
	"g00d",
	"nice",
	"great"
}

local PlayerKeywords3 = {
	"uw0tm8",
	"u w0t m8",
	"y u",
	"wuv",
	"luv",
	"w0t",
	"w8",
	"fien"
}

local PlayerKeywords4 = {
	"pie",
	"food",
	"trains",
	"houses",
	"toilets",
	"power",
	"roblox",
	"robloxians",
	"celebrities",
	"people",
	"world",
	"youtube",
	"twitter",
	"ig",
	"instagram",
	"studio"
}

local PlayerKeywords5 = {
	"ikr",
	"i know right",
	"okay",
	"ok",
	"kk",
	"k",
	"kay",
	"kai",
	"what",
	"really",
	"crazy",
	"bad",
	"whet",
	"heh",
	"huh",
	"sorry"
}

local PlayerKeywords6 = {
	":o",
	":/",
	";o",
	";)",
	";')",
	":)",
	";(",
	";'(",
	":(",
	":3",
	"?",
	"?.?",
	"OoO",
	"O>O",
	"v.v",
	">.>",
	"<.<",
	"(>^.^)>",
	"<(^.^<)",
	"^.^",
	":I",
	":|",
	"o.o",
	":P",
	"xD",
	"XD",
	"xd",
	"c:",
	":c",
	"c;",
	";c",
	";'c",
	"C:",
	"C;",
	"C;",
	"o-o",
}

local PlayerKeywords7 = {
	"bye",
	"bai",
	"cya",
	"see ya",
	"later",
	"peace",
	"dueces",
	"goodbye",
	"gudbye",
	"g00dbai",
	"goodbai",
	"gudbai",
	"g00dbye"
}
local Dialog1 = {
	"Wassup bruh?",
	"yeeee supppp",
	"Hello, mate!",
	"hi :3",
	"sup..",
	"Wassup... geez..",
	"What is that?",
	"I DUNT SPEAK YO LANGUAGE!!1!1!",
	"haiiii!!!"
}

local Dialog2 = {
	"Thank ya!",
	"Thanks!",
	"Thank you!",
	"You're great!"
}

local Dialog3 = {
	"i dunt want chu",
	"i dunt want chuuu",
	"w0t",
	"i wuv u 2",
	"i luv u 2",
	"w0t 2 u 2",
	"wait 4 w0t?",
	"thank chu!!1!1!"
}

local Dialog4 = {
	"I like pie!",
	"Ew food!",
	"Eh, trains arn't that bad..",
	"houses....house..HOUSE!!",
	"By the way, I need to go pee!!!",
	"I OVAP0W3R CHU!!",
	"Roblox is fun! But it gets boring after awhile",
	"I dunt knoe...",
	"I'm not a mainstream person..",
	"People.. I like people!",
	"Global warming is bad...",
	"Youtube, we broadcast everywhere!",
	"Follow me on twitter! I'm NoobyNoobCaiks!",
	"I rarely get on instagram... so.",
	"Roblox studio is a twist!"
}

local Dialog5 = {
	"I knoww",
	"I knowww",
	"mhm",
	"okay..",
	"Huh?",
	"Yes really.",
	"yeah ik u cray cray 2",
	"yah im badddd",
	"Yasss",
	"hehehehe c:",
	"*stares*",
	"It's okay! c:",
}

local Dialog6 = {
	"o-o",
	"I don't like faces!"
}

local Dialog7 = {
	"Goodbye!"
}

local DialogExtra = {
	"I don't understand you..",
	"ye okay *doesn't understand*",
	"Don't quite understand ya!",
	"What...",
	"Really? That language scares me...",
	"I understand bruh!!! *doesn't understand*",
	">.> <.< *runs*",
	"So much weird languageeee",
	"Hey, I don't really understand."
}

function StartChat(Plr)
	for _,v in pairs(game.Workspace:GetChildren()) do
		if (v:IsA("Model")) then
			if v:findFirstChild("Humanoid") ~= nil then
				if v:findFirstChild("Torso") ~= nil then
					if (script.Parent.Position - v:findFirstChild("Torso").Position).magnitude <= 5 then
						Plr.Chatted:connect(function(msg)
							if msg:lower():sub(1,2) == {PlayerKeywords1[4],msg}
						end)
					end
				end
			end
		end
	end
end

Instead of using a bunch of if statements

if (v:IsA("Model")) then
if v:findFirstChild("Humanoid") ~= nil then
if v:findFirstChild("Torso") ~= nil then
if (script.Parent.Position - v:findFirstChild("Torso").Position).magnitude <= 5 then

You can just use

if v:IsA("Model") and v:findFirstChild("Humanoid") and v:findFirstChild("Torso") and script.Parent.Position - v:findFirstChild("Torso").Position).magnitude <= 5 then

You don't have to use if something ~= nil you can just use if (condition) then and you can put multiple conditions in one statement by using and. Try that, remove ends.