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'
(..) You're not too busy for something Iike that? Your Majesty, Lady Jerome has arrived... and l have the French Consulate's assistant on hold. He wants to confirm tonight's dinner. Send my apoIogies. CanceI everything for today. l'm being shown (..)2001 The Princess Diaries