using xaml and xml ,mobile app development,c# application

Your boss has assigned you to create a cell phone app that will allow the user to view the dates and times of plays at the Fox Theater. Once the user has determined what play they would like, they can reserve a ticket(s) through the app. This first phase of the app will not require them to pay for the ticket. They can pick it up at Will Call at the Theater. It will however, keep track of the number of seats currently available and what is left after someone reserves a seat. HINT: Store data in?? The user can also return to the app and remove the ticket reservation if needed. Hint: How does the app know who the person is