change order of bookings

<?php
/*
Changes the order of bookings lists by latest date first, such as in the 'my bookings' page and bookings admin tables.

For instructions on adding snippets, see here - http://wp-events-plugin.com/tutorials/how-to-safely-add-php-code-to-wordpress/
*/
function my_em_change_bookings_list_order( $args ){
    $args['orderby'] = 'booking_date';
    $args['order'] = 'DESC';
    return $args;
}
add_filter('em_bookings_get_default_search', 'my_em_change_bookings_list_order', 10);
//from EM 5.9.7 onwards change filter to em_bookings_table_get_bookings_args and this will only apply to bookings table