Help with pathfinding npc updating?

So I am in need of some help with the new pathfinding system. I am currently trying to make an npc that follows the player with pathfinding and do not know how to update its path to recalculate the path if the player moves without the npc just freezing while the player is moving. Currently this is my code

local zombie = script.Parent
local human = zombie:FindFirstChild("Humanoid")
local zombieRoot = zombie:FindFirstChild("HumanoidRootPart")
local pathFindingService = game:GetService("PathfindingService")

wait(1)

if not human then return end

while wait() do
    if script.Parent.Agro.Value == false then
        local players = {}
        for i,v in pairs(game.Players:GetChildren()) do
            local char = v.Character
            if char then
                local root = v.Character:FindFirstChild("HumanoidRootPart")
                if (root.Position - zombieRoot.Position).magnitude <= 25 then
                    table.insert(players, v.Character)
                end 
            end
        end

        if players[1] ~= nil then
            local locations = {}
            for i,v in pairs(players) do
                local pos = (v.HumanoidRootPart.Position - zombieRoot.Position).magnitude
                table.insert(locations, pos)
            end

            local key, max = 1, locations[1]
            for i,v in pairs(locations) do
                if locations[i] > max then
                    key, max = i, v
                end
            end

            local plr = players[key]

            script.Parent.Agro.Value = true
            script.Parent.Target.Value = plr

            repeat wait() 
                local start = script.Parent.HumanoidRootPart
                local finish = script.Parent.Target.Value.HumanoidRootPart.Position

                local path = pathFindingService:FindPathAsync(start.Position, finish)
                local waypoints = path:GetWaypoints()

                for i,v in ipairs(waypoints) do
                    if finish ~= script.Parent.Target.Value.HumanoidRootPart.Position then
                        break
                    else
                        human:MoveTo(v.Position)
                        human.MoveToFinished:Wait()
                        if v.Action == Enum.PathWaypointAction.Jump then
                            human.Jump = true
                        end
                    end
                end
            until plr.Humanoid.Health < 1 or (plr.HumanoidRootPart.Position - zombieRoot.Position).magnitude > 30

            script.Parent.Agro.Value = false
            script.Parent.Target.Value = nil
        end
    end
end

If anyone could help and shine some light on this that would be awesome, thank you.