<?php 

add_filter( 'em_bookings_get_default_search', 'my_em_bookings_get_default_search', 100, 1 );
function my_em_bookings_get_default_search( $search_defaults ){
	if ( 
         ( isset($_REQUEST['person_id']) || $_REQUEST['action'] == 'em_bookings_table' ) 
         && !is_admin() 
         && !current_user_can( 'manage_options' ) 
       ){
		$current_user = wp_get_current_user();
		$search_defaults['owner']  = $current_user->ID;
		$search_defaults['person'] = $current_user->ID;
	}
	return $search_defaults;
}