El empleado de la línea aérea nos registró

El empleado de la línea aérea nos registró las maletas.
This sentence means - the employee at the airport registered our bags.

The other options are: la ventanilla, which means window, el vuelo, which means flight, and la aduana which means customs. 

1.  no eres nadie(you are no one)2.no tienes a nadie(you have nothing)