Translation of Genitiv

Two weeks ago I met a girl from Indiana and she told me that she was really sorry but that she would have no knowledge about Europe, Africa or Asia and that it was only due to lack of information on TV.
While time is a great healer, it is very difficult and not necessarily advisable for a country to forget its past, therefore history always keeps the tensions to others alive. I will explain.
I called the Hilton hotel in Cuba and asked them whether it was worth coming or if they suggest to postpone the arrival. Their response was clear: Don't come unless you really have too.