System and method for enhancing sales for service providers by utilizing an opportunistic approach based on an unexpected change in schedule of services

Sales associated with service providers is increased using an opportunistic approach based on an unexpected change in a schedule or services (time, location). Windows of opportunity (time, physical location) are automatically identified, and once such a window of opportunity is detected, the people affected directly from the change of a schedule are identified. This information is then used by services providers to act quickly, in order to enhance sales. Heuristics to determine a window of opportunity are based only on schedule changes (which are associated with a rule database), and without knowing who the affected people are or what their preferences (profile data) are.