NASHVILLE — Federal authorities are offering a reward for information on the location of a missing 14-year-old Tennessee girl who is believed to be with a wanted sex offender.The U.S. Marshals Service says it is offering a reward of up to $5,000 in the search for Hayleigh Wilson, who was last seen with 41-year-old Benjamin Shook.Marshals in Tennessee also want Shook for failure to register as a sex offender.Witnesses reported seeing Wilson, of Surgoinsville, with Shook on June 24 near a campground in Sugar Grove, Va., where a driver dropped them off after picking them up earlier.