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the possible dates for the event. Upon pressing on "Pick possible dates" button he will come to  Pick Dates window shown on Figure 3. The structure of the picking dates window is similar to theiphone default alarm clock interface. The Month  Week and Day can be set with scrollable selectors that move up and down with a flick (Similar to alarm choosing interface). The time slots can be marked available and unavailable and after selection clicking done button brings Jack back to the event creation window. He can then select the invitees from his contact list (Shown on Figure 4). This interface is similar to iphone contact interface. He can add import contacts as well as search for them in the autocomplete search input box.  He selects Bill from his contact list, however he did not previously have Kate's contact and he adds her as a new contact. By pressing the Done button he sends invitation to Kate and Bill. When Kate and Bill receive invitations, push notification will appear on their phone as shown on figure 5. They can just simply reply "I can not go" or they can choose the dates appropriate for them via the Pick Dates interface and send the reply back.
   (Figure 2)          (Figure 3)         (Figure 4)         ( Figure 5)

Design 2

Storyboard

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