Before starting create a dummy rig in a folder in workspace called NPCs, next add in a gui in startergui and customize it but make sure to add a promptlabel, linelabel, and a folder called sounds next add two sounds into the folder and call them click and talk then add a local script into the gui and paste these lines of code into it:
local RunService = game :GetService( “RunService” )
local UserInputService = game :GetService( “UserInputService” )
local Players = game :GetService( “Players” )
local DetectedNPC = nil
local Detected = false
local Chatting = false
local Skip = false
local Exit = false
local Player = Players.LocalPlayer
local Camera = game .Workspace.CurrentCamera
local Gui = script .Parent
local Sounds = Gui.Sounds
local PromptLabel = Gui.PromptLabel
local LineLabel = Gui.LineLabel
local Character = Player.Character or Player.CharacterAdded: Wait ()
local CharacterHumanoidRootPart = Character:WaitForChild( “HumanoidRootPart” )
local NPCS = game .Workspace:WaitForChild( “NPCS” )
UserInputService.InputBegan:Connect( function (Input)
if Input.KeyCode == Enum .KeyCode.X then
if Chatting == true then
Skip = true
Sounds.Click: Play ()
end
end
end )UserInputService.InputBegan:Connect( function (Input)
if Input.KeyCode == Enum .KeyCode.Z then
if Chatting == true then
Exit = true
Sounds.Click: Play ()
end
end
end )UserInputService.InputBegan:Connect( function (Input)
if Input.KeyCode == Enum .KeyCode.E then
if Detected == true then
local Lines = DetectedNPC:FindFirstChild( “Lines” )
if Lines then
Sounds.Click: Play ()
Chatting = true
Detected = false
LineLabel.Text = “”
PromptLabel:TweenSize( UDim2 .new( 0 , 0 , 0 , 0 ,), “Out” “Linear” , 0 . 2 )
LineLabel:TweenPosition( UDim2 .new( 0 , 0 , 0 . 8 , 0 ,), “In” “Linear” , 0 . 2 )
wait ( 0 . 5 )
for i, Line in pairs (Lines:GetChildren()) do
for i = 1 text do
LineLabel.Text = string.sub (Text, 1 , i)
Sounds.Talk: Play ()
if Skip == true then
Skip = false
LineLabel.Text = Text
b reak
end
if Exit == true then
b reak
end
end
wait ( 0 . 07 )
end
if Exit == true then
Exit = false
b reak
end
repeat wait () until Skip == true or Exit == true
Skip = false
end
Exit = false
Skip = false
PromptLabel:TweenSize( UDim2 .new( 0 , 0 , 0 , 0 ,), “Out” “Linear” , 0 . 2 )
LineLabel:TweenPosition( UDim2 .new( 0 , 0 , 1 . 2 , 0 ,), “Out” “Linear” , 0 . 2 )
wait ( 0 . 5 )
Chatting = false
Detected = false
end
end
end
end )RunService.RenderStepped:Connect( function ()
if Detected == true and Chatting == false then
local Humanoid = DetectedNPC:FindFirstChild( “Humanoid” )
local HumanoidRootPart = Character:FindFirstChild( “HumanoidRootPart” )
if Humanoid and HumanoidRootPart then
Camera.CameraType = Enum .CameraType.Scriptable
Camera. CFrame = Camera. CFrame : Lerp (HumanoidRootPart. CFrame ***** CFrame . new (- 4 , 4 , - 7 ) ***** CFrame .fromOrientation( math . rad ( 215 ), 0 ), 0 . 07 )
end
else
Camera.CameraType = Enum .CameraType.Custom
end
end )
then add a folder into your rig and call it lines then add a string value called line1, for the value type what you want the npc to say.
then it should be done and working 
(sorry if my code is messy I’m not that good)