A system 110 includes an input/output 113 unit for receiving a user request to call an elevator 101, 102 and a processor 111 for processing the user request to assign an elevator to the user 105. The processor performs one of a first assignment process and a second assignment process. The first assignment process includes determining whether a delay condition exists for delaying assignment of the elevator to the user 202, delaying assignment of the elevator to the user based on determining that the delay condition exists 203, and assigning the elevator to the user based on determining that the delay condition does not exist 204. The second assignment process includes assigning the elevator to the user and notifying the user of the assignment, determining whether an assignment change condition exists 206, changing the assignment to another elevator based on determining that the assignment change condition exists 207, and notifying the user of the assignment change 208.