Sir u had booked Ticket of a Lady Pax, who is 45+ in Age.
So She is Above 45, IR's are allotting Different Quota ticket. i.e SS Quota
Which Mean Lower Berth Quota. So that's the Reason she got CNF Ticket
Extra Benefit for the Ladies who is Above 45 :-)
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* Lower berth quota(SS quota) is allotted only to the single lady passenger of age 45 and above travelling alone or senior citizen passenger travelling alone.