Hello @zhiyichan
Thank you for your request.
If this error message appears it can have several reasons. Have you entered the correct travel date? Try to split the booking, i.e. book each train separately. It is also possible that this connection is already fully booked.
If the problem persists, you can always contact our telephone support on 0848 44 66 88 (CHF 0.08/min).
Have a nice day. Kind regards,
ZoeS
