A student at the University of Utah has vanished after taking ride-share service Lyft from Salt Lake City International Airport to an industrial park in the early morning hours of June 18.

Friends and family do not know why Mackenzie Lueck, 23, took the Lyft service from the airport to the North Salt Lake industrial park and not to her home or her college sorority. The driver of the Lyft has been fully cooperating with police, who do not believe he was involved in the woman’s disappearance.