"Jó estét, László!"
Translation:Good evening, László!
The full sentence is "Jó estét [kívánok], László!", kívánok (I wish) has a direct object in the sentence, i.e. the good night.
Some people claim László was the equivalent of Leslie, but the reality is that László is a medieval Hungarian name worn by 5 Hungarian kings, not used for centuries. It came back to use around 1800,and it is currently the most common male name. Slavic version is Vladislav, but the name does not have any relation with Leslie.