We want to use Appointments to reserve conference rooms. We have options for 1/2 hour, 1 hour, 90 minutes and 2 hours. When someone chooses one of these options from the dropdown, the available starting times change so that if you choose 2 hours, you can only choose your time to start at 8:00, 10:00, 12:00, etc. Why does this change and prevent someone to schedule from say 9:00-11:00 or even 9:30-11:30? The starting time should not be dependent on how long the appointment is.