to make an appointment; to make a reservation
reservation system; appointment system; (on) a subscription basis
reservation; order acceptance
reservation slip; reservation voucher
confirmation number; reservation number; reference number
tentative reservation; tentative booking
reservation required; prior booking essential
booking confirmation; reservation confirmation
publication after securing subscriptions
share warrant; subscription warrant; call option
reservation desk (of an airline)
online booking; online reservation
bandwidth reservation; bandwidth contract
reservationist; person whose job is to take reservations