Directly adjacent to the Las Vegas Convention Center is a Renaissance hotel with a pair of special staff members: robots. Savioke's Relay robots have been on the job for three months, helping out the concierge by delivering items to guests during peak hours. The two robots, named "Elvis" and "Priscilla" by the hotel, pick up orders from the front desk, call and ride the elevators without help, and call the guest's room phone when they've arrived. They navigate autonomously, based on a pre-generated map, so there's no problem if they lose Wi-Fi or LTE signal. I got to watch a delivery in action (to a demo room), and it was a seamless experience.