When the train tickets from Khiva to Bukhara for September 2 will be available?

Hello! I am constantly checking the Uzbekistan Railways website because I need to buy the train tickets from Khiva to Bukhara (fast train leaving at 7.20) for September 2. As far as I have understood in the past weeks, tickets are generally made available with a shorter advance (two/three weeks before departure), but I have always generally seen a few available places at least in the lastly made available trips. This morning I checked again and I have seen that no tickets are available for the entire month of August... is it possible? Does somebody know exactly when the tickets for September 2 will be available? I hope I explained myself properly, and thanks in advance!