You guys took it all wrong.. May be I didn't explain properly. It was on one of those flights that was like booked all up but when time came close, I could see some seats released. So was it that agents dummy booked or what? N my travelling on any of these flights does not have to do anything with dummy booking n neither do I want revenue pax to be stopped as I have a standby option for me. So again, the question is that why do these seats get booked n then un-booked?