The online travel agency slipped after it forecast second-quarter earnings that trailed estimates. Profit will be from $7.20 a share to $7.40, Priceline said. Analysts expected $7.43. Priceline gets about 60 percent of its revenue from overseas, mostly in Europe, which is suffering from a debt crisis. While bookings in its global business are still expected to rise 37 percent this quarter, that’s a slowdown from 54 percent in the first period.