A -> B Seats not available...
Jis pax ki tckt WL hai uske source aur destination ke beech 0 seats hi available hongi..wrna uska tckt cnf nhi ho jata??
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For Eg. SEAT NO. 1 in 12952 is vacant from NDLS to KOTA...and WL pax booked for NDLS-MMCT....then that SEAT 1 will be given to any pax who would be going till KOTA....