Relationships laravel 5

I am trying to understand how to set up this relation for my application:

one to many and many to one.

what I want to achieve is this:

User has many bookings and a room has many bookings, I'm not quite sure if I need a pivot table in order to achieve it.

so far I got this

Room model

    <?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Room extends Model
{
    protected $table  = 'rooms';
    protected $fillable = ['name','enabled'];

    public function category(){
        return  $this->belongsTo('\App\Category','category_id');
    }

    public function bookings(){
        return $this->hasMany('\App\Booking','room_id','id');
    }
}

User model

<?php

namespace App;

use Illuminate\Auth\Authenticatable;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Auth\Passwords\CanResetPassword;
use Illuminate\Foundation\Auth\Access\Authorizable;
use Illuminate\Contracts\Auth\Authenticatable as AuthenticatableContract;
use Illuminate\Contracts\Auth\Access\Authorizable as AuthorizableContract;
use Illuminate\Contracts\Auth\CanResetPassword as CanResetPasswordContract;

class User extends Model implements AuthenticatableContract,
                                    AuthorizableContract,
                                    CanResetPasswordContract
{
    use Authenticatable, Authorizable, CanResetPassword;

    /**
     * The database table used by the model.
     *
     * @var string
     */
    protected $table = 'users';

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = ['name', 'email', 'password'];

    /**
     * The attributes excluded from the model's JSON form.
     *
     * @var array
     */
    protected $hidden = ['password', 'remember_token'];

    public function bookings(){
        return $this->hasMany('\App\Booking','user_id','id');
    }
}

Booking model

<?php

namespace App;

use Carbon\Carbon;
use Illuminate\Database\Eloquent\Model;

class Booking extends Model
{
    protected $table = "bookings";
    protected $fillable = ['day','start','end'];
    protected $dates = ['day'];
    /*protected $casts = [
        'is_all_day' => 'boolean'
    ];*/
    public function room(){
        return  $this->belongsTo('\App\Room','room_id');
    }

    public function user(){
        return  $this->belongsTo('\App\User','user_id');
    }

}

this is my migration table for bookings

<?php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateBookingTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('bookings', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('room_id')->unsigned();
            $table->foreign('room_id')->references('id')->on('rooms')->ondelete('cascade');
            $table->integer('user_id')->unsigned();
            $table->foreign('user_id')->references('id')->on('users')->ondelete('cascade');
            $table->date('day');
            $table->string('start');
            $table->string('end');
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('bookings');
    }
}

BookingController

public function store(BookingRequest $request)
    {
        $room = Room::find($request->room);
        $booking = new Booking(array_except($request->all(),['category','room']));
        //dd($booking);
        $room->bookings()->save($booking);
        $room->bookings()->attach(Auth::user()->id);
        return redirect('bookings');
    }

via Chebli Mohamed