Redirect the user to a different page after they have submitted their reservation.

redirect-after-submit-for-rtb.php

<?php
/**
 * Plugin Name: Redirect After Submit for Restaurant Reservations
 * Plugin URI: http://themeofthecrop.com
 * Description: Redirect the user to a different page after they have submitted their reservation.
 * Version: 1.0
 * Author: Theme of the Crop
 * Author URI: http://themeofthecrop.com
 * License:     GNU General Public License v2.0 or later
 * License URI: http://www.gnu.org/licenses/gpl-2.0.html
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU
 * General Public License as published by the Free Software Foundation; either version 2 of the License,
 * or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write
 * to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */
if ( ! defined( 'ABSPATH' ) )
	exit;

/**
 * Hook in after a booking has been submitted
 */
if ( !function_exists( 'rtbras_redirect' ) ) {
add_filter( 'rtb_insert_booking', 'rtbras_redirect' );
function rtbras_redirect( $booking ) {

	// Change the id from 1 to the id of the page you would like to
	// to redirect to.
	$id = 1;

	?>

	<script type="text/javascript">
		window.location.replace( "<?php echo get_permalink( $id ); ?>" );
	</script>

	<?php
}
} // endif;