Where are you going??

Geneva to where?

For internal Swiss trains reservations are not required, often not possible and generally not necessary.

Where are you going. From Geneva there are a lot of trains. 

At 9:15 there is a IC to Zurich. For travelling in Switzerland normally nobody reserves seats, because trains run frequently, only tourists that do not know this and groups do this. You can reserve a seat via Swiss Railways for 5 CHF or via Austrian Railways for 3 EUR. 

Geneva to Venice. The trains in Switzerland do not require seat reservations (yay) but going from Switzerland to Italy does. My problem is it shows a 12:30 departure from Geneva not the 9:15 I got the pass for 

The EC to Venice does not run at 9:15 am

The EC to Venice starts from Geneve at 7:39, but in September there are works on the line in Italy between Domodossola an Milan. 

There is a bus service instead from Domodossola to Milan. 

The problem is you can’t reserve a seat for the bus, but I don’t know how it should work with Interrail/Eurail Passes, you could try to run via Gotthard to Italy, or from Domodossola with an scenic train to Locarno and from there to Milan and beyond. 

For the moment there are no further information. In the next weeks there should be some news. Normal Ticket booking is also not open yet for this period on this line due to the works. 

On the 09.15 change at Olten and Milan. You  need reservations between Olten and Milan and Milan to Venice. See details on the reservation section about how to reserve. Both trains have supplements 

I see now, that via Trenitalia the booking is opened and you pay 10€ for the bus. There are no other prices. The reservation costs 11€, so I would suggest to you with todays information, to search for trains Geneva-Domodossola to book from there a BUS (note, that the regional trains on the line are not changed yet, and it says that they run, but it is not so) or to wait for a replacement of the regional train (for free with Eurail), and book a reservation for the first available train to Venice from Milan (Plan a lot of time to change, because busses run on bussy streats and they will have delay). You can book via Austria Railways reservations for Italy (it works better and it cost less - here how it work: How to get Reservations | Community) 

Or you change route and use only trains via other routes like via Domodossola-Locarno-Chiasso-Milano or via Arth Goldau-Lugano-Chiasso-Milano and the Gotthard Base Tunnel. 

Thanks for the advice. The other issue I have is no matter what train trip I put in I can’t change the departure time. From Geneva to Venice at the top where you search it automatically puts in Noon. From Venice to Florence a couple days later, same thing. There must be a way to choose a different departure time but I cannot figure it out. Help! 

You don't need to enter the journey yet. If you wait the Rail Planner will hopefully be updated. Please read more below about planning your trip and other important information. 

Here is some useful information from the experienced travellers in the Community regarding both planning, reservations and activation of pass and travel days. 

 Planning

The rail planner is normally not up to date, as it only is updated once a month, so to be sure of the time table you better check the timetable and availability on the websites of the national railways. The bigger national railways, like DB (Germany) SBB (Switzerland) and ÖBB (Austria) cover several countries. 

 Reservations