Abstract: The invention described herein is a computer implemented method and system for scheduling an appointment between a provider and one of a plurality of waiting clients that are matched and ranked by likelihood of availability. The moment the provider inputs an available appointment opening into the system, the system cross-references the appointment time with the clients' availability and multiple other temporal, geographical, and situational variables; selects and ranks the clients who are likely able to attend the appointment opening; and sends said clients a computer-generated notification message (via email and/or SMS text message and/or voice message) regarding the appointment opening. The clients' availability and their temporal, geographic, and situational variables may be updated by the system in real-time so that the system selects and ranks clients based on availability information that is as accurate as possible.