A system dynamically assigns spaces to users. The system acquires scheduling information for users and identified times when one of the spaces should be assigned to a group of the users (e.g., when a meeting is scheduled). The system may select the space based on the size of the group. The users wear smart identifier (ID) badges that transmit short-range communications signals. A detector detects the signals and may forward a notification to the system identifying the users' locations. The system dynamically re-assigns the space to different users if more than a threshold portion of the group members are, based on the determined locations, not expected to reach the reserved space at the scheduled time. The system assigns a different space to the group that is closer to the determined locations and/or more appropriately sized for the number of available group members.