We have a visitor check-in system too, where they have to provide proof of identity to a member of our public safety team and receive a visitor badge. Volunteers at those checkpoints are there primarily to escort guests to their destination. And, when there's a line, they'll chat with the people who are waiting, letting them know what they need to prepare and making polite conversation. They also help with collecting guest badges when they leave, just reminding guests to turn in their badge, and helping to properly dispose of the badges. Volunteers for this role also restock sanitation stations at entry ways and collect wheelchairs after use. They don't do any of the actual guest registration/badging though.
