Selecting two names from a table

Hi, I have a table called Bookings and a table called User. Bookings are created and hold the User_ID of the User who created it (Booking.Booked_User) and the User who will be going on the booking (Booking.Booking_Creator). How can I create a report that lists both users on each row. If I do 'SELECT U.User_Name, B.Booking_Date FROM WMS_User WHERE B.Booking_Creator = U.User_ID AND B.Booked_User = U.User_ID', then the query returns no data. So for each row in the table I need to somehow select 2 names from the user table based on 2 different User_ID's held in the Bookings table. Any help would be greatly appreciated. Thanks for your help