CHICAGO (CBS) — Police have found a University of Illinois student who disappeared after he checked in for a flight at O’Hare International Airport, but never boarded the plane.

Hye Min Choi, 19, has been reunited with his family. No additional details were released.

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He was last seen on Saturday when he was scheduled to catch a flight to Greensboro, N.C.

The electrical engineering student, who also goes by the first name Joseph, had checked out of his dorm, took a bus to Chicago, and checked in his luggage on United Airlines flight 5892, but he never boarded the plane.

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His mother was waiting for him in North Carolina and quickly realized he wasn’t on the flight.

Police said he did not re-book another flight with United.

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Sources said Choi might have been upset over his final exams, but authorities would not confirm that.