Travelyaari.com — non booking of a seat

Address:

147001

When i try to book a seat in volvo bus for travel from patiala to delhi in bus departing at 4.20 am and 5.00am, the system is showing one seat available in both the buses but when i try to make payment the system shows a message"the seat has been booked by some one else" and the same message is being repeated since the last two hours despite the fact that one seat is available there in both the buses.