Hi everybody, 

I would like to make a reservation for me and my two friends for our trip to North Europe but there is a problem because I can’t reserve seats or beds in the train from Berlin and the problem is described as follows: “Prices unavailable

No price results were found for this connection. It is possible that all pass holder seats are sold out. Please try searching for another connection or check 'More information' and try other ways to book this seat reservation. If no pass holder seats are available anymore you need to buy a separate full fare ticket to board.”
Is it possible that the train is already sold out? I have tried to look for the same train e.g. in October and there is the same problem. I have also tried to book seats on websites of train companies but I wasn’t successful. Could you please help me anyhow? 
Thank you very much for advice!

Jáchym