public function edit($id)
{
    $user = User::with('roles')->findOrFail($id);
    $userRole = Role::pluck('name', 'id');
    return view('pages.edit', compact('user', 'userRole'));
}

public function update($id, Request $request)
{
    $user = User::with('roles')->findOrFail($id);
    $user->update($request->all());
    return redirect('users');
}

{!! Form::model($user, ['method' => 'PATCH', 'action'=>['UsersController@update', $user->id]]) !!}
<div class="form-group">
    <div class="form-group col-md-offset-3 col-md-6">
        {!! Form::label('name','Name: ') !!}
        {!! Form::text('name', null, ['class'=>'form-control','placeholder'=>'Here, user name']) !!}
    </div>

    <div class="form-group col-md-offset-3 col-md-6">
    {!! Form::label('roles','Roles: ') !!}
    {!! Form::select('roles',$userRole, null,['class'=>'form-control']) !!}
    </div>

    <div class="form-group col-md-offset-3 col-md-6">
        {!! Form::submit('Send', ['class'=>'btn btn-success form-control']) !!}
    </div>
</div>
{!! Form::close() !!}

Schema::create('roles', function (Blueprint $table) {
        $table->increments('id');
        $table->string('name');
        ...
    });
    Schema::create('role_user', function (Blueprint $table) {
        $table->integer('role_id')->unsigned();
        $table->integer('user_id')->unsigned();
        $table->foreign('role_id')
            ->references('id')
            ->on('roles')
            ->onDelete('cascade');
        $table->foreign('user_id')
            ->references('id')
            ->on('users')
            ->onDelete('cascade');
        $table->primary(['role_id', 'user_id']);
    });

Schema::create('users', function (Blueprint $table) {
        $table->increments('id');
        $table->string('name');
        ...
    });