G4S Customer Service Excellence with Dale Carnegie (G4Su) By G4S North America Training Institute Published: Sep 28, 2018 Duration 2m Difficulty Beginner Credential For Completion Rating 1 star 2 stars 3 stars 4 stars 5 stars Average rating: 2.0 2 2 reviews Replay Video This activity includes a preview of our G4S Customer Service Excellence Training Video.