rezervisati

1. to book; to reserve
   Rezervisala sam sto za osam sati. — I booked a table for eight o'clock.
   Sobu uvek rezervišemo preko interneta. — We always book the room online.
2. to set aside; to save
   Rezervisao sam ti mesto pored prozora. — I saved you a seat by the window.

In practice it is used as both perfective and imperfective.