public function executeHello(array $args, array $options = array())
    {
        $name = 'unknown';
        if (empty($args)) {
            $dialog = new Dialog($this->console);
            $name = $dialog->ask('What is your name?', $name);
        } else {
            $name = $args[0];
        }
        $this->writeln(sprintf('hello %s!', $name));
    }