Two Cortana reminder features you may not be aware about. A Reddit user has shared a Cortana reminder screenshot and it reveals how Cortana, Calendar and Maps integration works in Windows Phone 8.1. So in case you have set a calendar entry with help of Cortana and put a recognizable address then Cortana reminds you with the route map, likely time of travel and time of arrival at the destination.
Another neat feature is that Cortana actually records your voice instruction when you create a reminder with its help. So, when you edit the calendar entry you get to see a play button. By tapping on it you can actually listen to what you have said to Cortana in order to create the calendar entry.