Uber has partnered with national organizations to combat human trafficking through the education of its drivers. Uber is working with the National Center for Missing and Exploited Children, EPCAT USA, the McCain Institute, and now Polaris, which sponsors a National Hotline. Uber drivers have saved children from the horror of human trafficking through their recognition of the signs of trafficking.
See the article below from the Uber Newsroom on what Uber is doing to educate its drivers.
And remember, do not try to intervene yourself, as traffickers are dangerous. Call the Hotline, or call your local law enforcement.