Reservations may not overlap with existing reservations for the same seat. Each reservation type has different use-cases and rules:

~~assigned~~~~An assigned seat. Optionally may have no end date, representing a permanent assignment.~~ Deprecated, use /seats/:id/publish-shared-schedule
hot An ad-hoc, single-day booking. Must have an end time that is the same calendar day as the start time.
hoteled A reservation booked in advance that can be multi-day. Must have an end time.
reverse_hotel A reservation that is an exclusion for recurring reservations types such as assigned orshared. These reservations can be made on days when recurring reservations were freed up or shared.
shareduse /seats/:id/publish-shared-schedule