Oracle Database Discussions

I am trying to create a booking database...but the design I keep coming up with makes me a bit uneasy. I don't really like it (because of massive joins involved in determining what time slots are available) but I don't see any other way to do this. So this is my design.

--This table stores incidences of booked time slots
TABLE:Booking_Incidence
BookingID
BookingStartDate (DateTime)
BookingEndDate (DateTime)
FK_UserID

--This Table stores the generally available booking times for each week. Eg. If users can book from 9:00am to 5:00pm monday to friday then there would be an entry with
slotstarttime = 9:00, slotendtime=17:00,sun=false,mon=true,tue=true, wed=true, thur=true, fri=true, sat=false

TABLE:General_Avail_Booking
SlotStartTime (Time)
SlotEndTime (Time)
Sun (boolean)
Mon (boolean)
Tue (boolean)
Wed (boolean)
Thur (boolean)
Fri (boolean)
Sat (boolean)

--This table stores any possible exceptions that might occur outside of the general booking times (eg a holiday). bAvailable determines if the exception allows for a new booking, or cancels an existing one.

Table: Booking_Exceptions
SlotStartDate (DateTime)
SlotEndDate (DateTime)
bAvailable (boolean)


I use General_Avail_Booking and Booking_Exceptions to determine the possible times when users can actually book a time slot, and then store what time slots users book in Booking_Incidence.