Has your eticket been issued already, or just a booking held? If it is just a booking, then use the first link below for PNR status and it should pull up your details.
https://www.jetairways.com/EN/IN/Pla...NR-Status.aspx
The other link below for manage booking will work once the ticket is issued.
https://www.jetairways.com/en/in/pla...e-booking.aspx