Methods, systems, apparatuses, and computer program products are described. A scheduling platform may retrieve information indicating unavailable time resources for a set of users, a time resource representing a time period during which a user may be assigned an appointment. The scheduling platform may use the information to compute utilization scores for each user, which indicate an aggregation of unavailable time resources for a user. After receiving a request to utilize an available time resource for a specified time slot, the scheduling platform may query a data object storing the utilization scores to identify a subset of users having lowest utilization scores with respect the set of users. The scheduling platform may retrieve information indicating whether the subset of users are available during the specified time slot and identify one or more users available for the specified time slot.