WueryB

// WP_Query arguments
$args = array(
	'name'                   => 'bookings',
	'post_type'              => array( 'mec-books' ),
);

// The Query
$user_bookings = new WP_Query( $args );

// The Loop
if ( $user_bookings->have_posts() ) {
	while ( $user_bookings->have_posts() ) {
		$user_bookings->the_post();
		// do something
	}
} else {
	// no posts found
}

// Restore original Post Data
wp_reset_postdata();