Show the first names and last names of all the guests that have apartment bookings with status code "Confirmed".
SELECT T2.guest_first_name ,  T2.guest_last_name FROM Apartment_Bookings AS T1 JOIN Guests AS T2 ON T1.guest_id  =  T2.guest_id WHERE T1.booking_status_code  =  "Confirmed"
guests with apartment bookings with status code 'Confirmed' refers to filtering Apartment_Bookings with booking_status_code = 'Confirmed'; showing first names and last names of guests requires joining Apartment_Bookings with Guests on guest_id and selecting guest_first_name and guest_last_name;