Hello miku1802
Welcome to the SBB Community.
We are not the SBB Customer Service.
The dining car is no longer offered on this line, and this for almost one year already.
IR15 was the only IR line having a dining car (usually only IC trains have dining cars), but it was simply not profitable.
If you would like to share your thoughts with SBB, please use this form:
https://www.sbb.ch/en/help-and-contact/customer-service/praise-comments/reklamation.html
Kind regards,
Roland