Have you ever booked a flight or hotel and then noticed that the prices drop after you've shelled out? A computerised legal tool has expanded its offerings in a bid to help travellers recuperate losses like this on holiday bookings. DoNotPay - masterminded by Stanford University tech whizz Joshua Browder - uses a'robot lawyer' to find legal loopholes and negotiate cheaper prices or re-book reservations for customers if prices lower after they've paid. DoNotPay - masterminded by Stanford University tech whizz Joshua Browder - uses a'robot lawyer' to find legal loopholes and negotiate cheaper prices or re-book travel reservations for customers if prices lower after they've paid Once a customer signs up, the sophisticated bot automatically looks for all the travel confirmations in the user's email inbox and checks for fluctuations in price about 17,000 times a day until the departure date. If the flight or hotel price drops, DoNotPay claims it would bag the better deal and make the vendor refund the difference.