Booking Holdings Group offers a variety of online booking services, including airline tickets, car rentals, cruises, hotel rooms and vacations. Customers can choose to purchase travel services in the usual price-disclosed manner or through Name Your Own Price (which permits customers to bid for travel services at discount prices). Booking Holdings operates in Europe, North America, South America, the Asia-Pacific region, the Middle East and Africa. The company's Booking.com, Agoda (international) and Booking Holdings.com (U.S.) brands enable customers to reserve hotel rooms anywhere in the world. More than 80% of bookings are international (primarily in Europe). In the U.S., Name Your Own Price enables customers to use online bidding to save money on products and services, while allowing businesses to generate additional revenue. Customers can use the service to buy airline tickets, book hotel rooms, and reserve rental cars. In August 2014, Booking Holdings increased its investment in Ctrip, China's largest online travel agency. Through a convertible bond offering, Booking Holdings invested $500 million in Ctrip and acquired the right to purchase up to 10% of that company's shares. In July 2014, Booking Holdings paid $2.6 billion in cash to acquire OpenTable, which provides restaurant reservations online in the U.S. and internationally. In May 2013, it paid $2.1 billion in stock and cash to acquire KAYAK Software Corp. KAYAK searches travel sites to obtain the lowest hotel room and airline ticket prices. In 2012, the company pa