, one can only wish
is correct, it's simply the fist character of the booking reference.
If you are on international flights, click this AMADEUS Link
and whack that booking reference
and your Surname
in and hit enter. It should show details of your booking.
If you click the black +
's in little boxes with Orange
background; you will get more details, including any allocated seating. Click this and you may even get a seatmap and you can see where you have been put.