Error of the setting for navigation

The error message says that the selected page “NewReservation” expects an object of type “Reservation”, which is not available here.  Could you possibly tell me how to fix this error ? 
1 answers

As this page displays a single Reservation object, you can either create (or retrieve) a reservation in a microflow and then open the page with that Reservation object using a Show Page action.  Once you create this microflow, you should use it instead of the MyReservation page as the target for the navigation item in your screenshot above.

Hope that helps.