Retrieve the availability of motorbikes which are not in revision or in training

I am looking a way to retrieve the availability of motos which are not in revision or training.

I have a form named motorbike with 3 fields (matriculation, number_motorbike, status).

Here, I have 3 motorbikes and 1 unavailable number motorbike -> 000001.

My second form is revision with 4 fields (date_revision_start, date_revision_end, garage, fk_motorbike).

I only have 1 motorbike in revision.

In my form trainings I have 2 fields (date_sitting, fk_motorbike).

Here, when I add for example 1 motorbike which is in revision, there is no blocking, it's my problem.

In the form create.blade.php, Is it possible, to see only the motorbikes availables every day for example?

I really stuck on this problem... I thank in advance for your help and your time.

Controller -> Training

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Motorbike;
use App\Training;

class TrainingController extends Controller
{

    public function index()
    {
        $trainings = Training::oldest()->paginate(5);
        return view('admin.trainings.index', compact('trainings'))
             ->with('i', (request()->input('page',1) -1)*5);
    }


    public function create()
    {   

        $motorbikes = Motorbike::all();
        return view('admin.trainings.create', compact('motorbikes', 'trainings'));

    }

    public function store(Request $request)
    {   

        $request->validate([
                'date_sitting' => 'required',
                'fk_motorbike' => 'required'
        ]);

        Training::create($request->all());

        return redirect()->route('trainings.index')
                ->with('success', 'new data created successfully');
    }

via Chebli Mohamed