req.flash("info", "No changes were made.");
res.redirect("/admin/dashboard");

<% if(messages.info) { %>
    <div class="modal-content flashModal" id="message-info">
        <div class="header">
            <span id="closeBtn">&times;</span>
        </div>
        <div class="modal-body">
            <strong>
                <%= messages.info %>
            </strong>
        </div>
    </div>
<% } %>