Have you booked your trip to the US?

To apply for US visa you do not need to make actual purchase of air, train tickets or hotel stay. If you have already made your flight and hotel bookings for visa, please make sure that all of them are refundable or allow you to postpone the travel dates in case there is a delay or other problem with your visa.

After you get your visa to USA, you may use any available travel agency or on-line booking sites to make your purchases.