Answers to questions about your firm's process
The assistant answers clients using the instructions your firm writes: how to send timesheets, which documents to provide, who to contact. It doesn't attempt questions that need professional advice; it passes them to a consultant with the background already gathered.
A client's employee asks on WhatsApp how to report parental leave and gets the list of documents and where to send them. When the owner asks whether to make a fixed-term contract permanent, that message lands with you, with the whole conversation attached.