Do you know the passenger? Can you ask them if they have hep c? Only about less than 4 % of the population has hep c o odds are relatively low of randomly encountering someone with hep c.
As an example if a health care worker should experience an accidental needle stick involving a patient with known hep c the odds of transmission are about 1.8%
Hep c infected blood must enter blood steam of an uninfected person if concerned have the hep c antibody test 12 weeks after this incident then you will know.
No one can estimate your relative risk in this circumstance. See your doctor