How to play a sound effect when the npc talk with you?

Hello, i am trying to make a sound play when a npc talk with you. But i can't, any suggestion?

Script:

local UIS = game:GetService("UserInputService")

local Template = script.Parent:WaitForChild("Template")
local E = script.Parent.Parent:WaitForChild("EThing"):WaitForChild("E")

local Player = game:GetService("Players").LocalPlayer
repeat wait() until Player.Character
local Character = Player.Character
local RootPart = Character:WaitForChild("HumanoidRootPart")

local VarHolder
local Text
local CurrentTrigger
local NPC
local db
local abletochange = true
local StoredValues = {}
local function DisableMove()
	if(Character.Humanoid.WalkSpeed~=0)then
		StoredValues = {Character.Humanoid.WalkSpeed,Character.Humanoid.JumpPower}
		Character.Humanoid.WalkSpeed = 0
		Character.Humanoid.JumpPower = 0
	end
end

local function EnableMove()
	Character.Humanoid.WalkSpeed = StoredValues[1]
	Character.Humanoid.JumpPower = StoredValues[2]
end

RootPart.Touched:Connect(function(otherPart)
	if(otherPart.Name=="TriggerBlock3")then
		CurrentTrigger = otherPart.NPCTitle.Value
		E.Visible = true
		E.Parent.Adornee = otherPart
		NPC = otherPart.Parent.NPC
	end
end)

RootPart.TouchEnded:Connect(function(otherPart)
	if(otherPart.Name=="TriggerBlock3")then
		CurrentTrigger = nil
		E.Visible = false
		E.Parent.Adornee = nil
		NPC = nil
	end
end)

UIS.InputBegan:Connect(function(inputObject, gameProcessedEvent)
	if(inputObject.KeyCode==Enum.KeyCode.E)and(not(db))then
		if(CurrentTrigger)then
			SetNewNpc()
		end
	end
end)

wait (0)
script.Sound:Play()

function SetNewNpc()
	if(abletochange)then
		VarHolder = NPC.Parent.TriggerBlock3
		TextValue = VarHolder.Text
		Text = TextValue.Value
		SetNewTextBox()
	end
end

function SetNewTextBox()
	if(not(db))then
		db = true
		DisableMove()
		local TextBox = Template:Clone()
				TextBox.Parent = script.Parent
				TextBox.Text = ""
				TextBox.Size = UDim2.new(0,500,0,100)
				TextBox.Position = UDim2.new(0.5,-250,1,-150)
				TextBox.Visible = true
		for i=1,string.len(Text) do
			TextBox.Text = string.sub(Text, 1, i)
			wait(0.02)
		end
		UIS.InputBegan:Wait()
		TextBox:Destroy()
		if(TextValue:FindFirstChildOfClass("StringValue"))then
			VarHolder = TextValue
			TextValue = VarHolder.Text
			Text = TextValue.Value
			abletochange = false
			db = false
			SetNewTextBox()
		else
			EnableMove()
			wait(1)
			db = false
			abletochange = true
		end
	end
end