Exception Handling in Unexpected Scenarios

Forgiving designs forgive users for mistakes and slips. Forgiving designs help users recover from error situations. Forgiving designs lead users to do the right thing.

Take a look at Lufthansa website. If flights are not available for the mentioned dates, users are asked to look at online flights timetable. A link to the online timetable is provided in the error message, reducing user effort. 

Forgiving designs not just delight the users, but also empower users to choose other ways to bring in revenue for your product.

How forgiving are your products?