We consider an active information system, which aims to notify a traveler timely about a likely delay. Besides providing the right content, it should also wait for the best time for notification. This is especially true for mobile information services, where every notification may irritate the recipient. We formulate and solve such a problem involving best choices both for content and time of notification by modeling it as an influence diagram. The chosen example stems from the domain of personal travel assistance. Note that the action of the traveler is nothing else than a reaction to the notification from the information system.