Hi Limeuhu12
I find that the actual information is not bad, all options are mentioned, you have only to choose the right one, a kind of multiple-choice exam:
Your journey could not be booked. The train is already fully booked or has been cancelled due to engineering work, or the travel date is too far in the future (advance booking deadlines).
You have the following options:
We recommend selecting another connection.
For connections with changes: It may be possible to complete the purchase if you split the booking into the individual legs.
I you find the right answer, you will be qualified to be a “Bachelor” in the SBB Community.