[Faterson]

PS: If you specifically insist on using the app, you could try the same code (or its variaton) there following the two slashes. However, the usefulness of launching the app instead of Marvin's internal browser escapes me; both services rely on an active Internet connection, while launching the app would transfer you away from Marvin to the app every time, forcing you to return to Marvin manually every time -- which seems more time-consuming than simply pressing the "Book" button in the top-left corner of Marvin's internal browser pane. It is particularly time-consuming on the iPhone where you do not have the 4-finger swipe gesture available for easily swapping back and forth between two open iOS apps.