List the drivers who shipped the shipments to the least populated city.
least populated city refers to Min(population); name refers to first_name, last_name
SELECT T3.first_name, T3.last_name FROM shipment AS T1 INNER JOIN city AS T2 ON T1.city_id = T2.city_id INNER JOIN driver AS T3 ON T3.driver_id = T1.driver_id ORDER BY T2.population ASC LIMIT 1