Treat the referral call like a short professional conversation. Be ready to explain your background, why consulting, why the firm, and why the specific office or role.

The person may also be checking whether they feel comfortable putting their name behind you, so clarity and professionalism matter more than having perfect interview answers.

Have your resume ready and be prepared for a few questions about your experience and recruiting timeline.

have 60 sec story of your background ready.

I'd expect why firm / why consulting / what role, nothing crazy.