Sorry to hear that you are havng trouble with the timetable.
In case it is some other time table, please make sure that you are using the SBB timetable:
We recommmend that you access it through this page, and read the instructions carefully:
The timetable defaults to the fastest route, as a rule. That maybe why you having problems with the Schilthorn routing. As explained on the My Swiss Alps page, you must enter "vias" if you wish to control the routing in a way different from the default.
Todo that, you need the name of a station stop for a "via", although the timetable will often offer some choices.
A map that is particularly useful for this task is map.search.ch:
I have zoomed in that link to zoom level 4, as you can see from the URL..
Zoom in further, to zoom level 16, and the rail lines become clearly visible.
In the menu, under points of interest, click on "Traffic."
Icons appear for the modes of transportation selected. Zoom in to separate the names/icons...there are a lot of them:
Mouse over any icon and get the station name, as well as the transport routes that stop there. Click on the icon, and you get an abbreviated near term timetable.
You can use the station name to construct a route of your choice in the SBB timetable, using the via boxes. In the case of Schilthorn, you can route via Birg and Mürren, and from Mürren you can route via Stechelberg (bus to Lauterbrunnen) or Grütschalp ( train along the plateau above the valley on the side of the mountain, cable way down to Lauterbrunnen).
Hope that helps.
Regarding your table reservation, I would certainly expect the wording to be precise, consistent with normal Swiss practice. ;-)
That table will be available for your use in the time span specified. Just joking now, but if you come early or stay late, the "Table Police" will speak politely but firmly to you, and explain the rules. As I said, just a bit of humor (I hope) but, if you think about it, they have to run a busy restaurant like that with clearly defined timing.
Since you can count on the SBB timetable and the transport services up to Schilthorn, to be timely, the system works.
This may also help: