A system is provided for determining subscription data when a user requests to receive an output in the future when an event occurs. The system may determine an output type based on the capabilities of the output device and a trigger type. The system may determine a trigger type based on the priority of the triggering event. The system may also determine how many times the subscription is to be executed. Using this information, the system creates the subscription so that the user may receive a notification or an announcement when an event occurs.