An exhaustive search is underway for an Orange County couple reported missing Friday after they failed to return from a hike in Joshua Tree National Park. Rachel Nguyen and Joseph Orbeso, believed to be in their 20s, never checked out of their Airbnb accommodations on Friday and left all of their belongings behind, said Dan Messaros, incident commander for the search. After the pair were reported missing, authorities found their vehicle near the Maize Loop trail, a northwest area of the park. A ping from Orbeso's cellphone was also recorded about 4 p.m. Thursday from an area in the park. Authorities believe the couple went for a hike in the area, he said. Nguyen and Orbeso have not been seen or heard from since, Messaros said.