Hey, train bubble (@nprofile1q..., @nprofile1q...). DB have just informed me that our connection from Halmstad (Sweden) to Cologne on 8 August will not work, thus there is no more Zugbindung. However, for the Copenhagen – Hamburg leg there is compulsory reservation. We have a reservation for ECE 397 but would like to switch to ECE 395 (two hours earlier).

Where and how can I get a reservation for ECE395 without buying a new ticket?

Thanks!