I tried to make a reservation for access to the dome online for the week of January 9 to 12 but got a response that this is not available for those dates. Does anyone know if this means the dome is closed to access by the public at that time or is it too early to make the request? I was able to make a confirmed reservation for breakfast in the restaurant. If the dome is closed will I still be able to access it that way? My first time in Berlin, and this whole thing is a bit confusing. Any help with info appreciated.