Please name any three restaurants that have an unidentified region.
restaurant name refers to label; unidentified region refers to region = 'unknown'
SELECT T2.label FROM location AS T1 INNER JOIN generalinfo AS T2 ON T1.id_restaurant = T2.id_restaurant INNER JOIN geographic AS T3 ON T2.city = T3.city WHERE T3.region = 'unknown' LIMIT 3