According to Encyclopedia Titanica, the name of the Assistant waiter you were looking for was Louis Corvella.
You know that, in 1912, it was the early years of the Marconi system and some mistakes were done. That's why I do believe Orovello and Crovello was the same person.
Please, for instance, see the following article taken from ET archives. It's written "L. Crovetto, 17 [years old]".
www.encyclopedia-titanica.org
Best regards,
Franck