a dental 'assistant' [=a person whose job is to help a dentist]
She works as a 'sales assistant' [='salesclerk'] at Macy's.
a wealthy executive who has a personal 'assistant'
(..) Who's that? Another stiff can barely climb out of his sports car. - No, that's Bruce Wayne! - Mr. Wayne, over here! - I'm not sure if my assistant... - Right through here, Mr. Wayne. Thank you so much. Bruce Wayne... at a charity ball. Miss Tate, isn't it? Even before you became a recluse, (..)2012 The Dark Knight Rises