alerts.blade.php

@if (Session::has('info'))
<div class="alert alert-info alert-dismissible" role="alert">
  <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button>
  <strong>Info!</strong> {{ Session::get('info') }}
</div>
@endif

@if (Session::has('success'))
<div class="alert alert-success alert-dismissible" role="alert">
  <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button>
  <strong>Success!</strong> {{ Session::get('success') }}
</div>
@endif

@if (Session::has('warning'))
<div class="alert alert-warning alert-dismissible" role="alert">
  <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button>
  <strong>Warning!</strong> {{ Session::get('warning') }}
</div>
@endif

@if (Session::has('danger'))
<div class="alert alert-danger alert-dismissible" role="alert">
  <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button>
  <strong>Danger!</strong> {{ Session::get('danger') }}
</div>
@endif

FooController.php

<?php

namespace App\Http\Controllers;

use App\Http\Requests;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Session;

class FooController extends Controller
{
    
    public function index()
    {
      Session::flash('danger', 'Oops, some error ocurred');
      Session::flash('success', 'Ok, looks grate.');
      
      return redirect('/');
    }
}