<?php if(is_search()) : ?>
<article class="no-search-results">
<p class="lead">Your search did not match any pages.</p>
<p>Suggestions:</p>
<ul>
<li>Make sure that all words are spelled correctly, and try again</li>
<li>Try different keywords</li>
<li>Try more general keywords</li>
<li>Go back to the <a href="<?php bloginfo('url'); ?>">home page</a></li>
</ul>
</article>
<?php else : ?>
Modify content-none.php