I've tried to book Munich to Lucern 0717 train on DBahn website in early Aug (EC & IR). and would like to reserve seats for my family on the EC section. But the website states, "EC 196: München Hbf - Buchloe: Construction work. Train is running 5 minutes early. With the changes in departure time a reservation is temporarily unavailable. Please check your itinerary again shortly before departure."
Probably this construction starts in Aug as seat reservation can be done for July departure trains.
I wrote to DBahn and what if i bought online tickets first and reserve seat later, they wrote back, "A pure seat reservation for international connections is not possible on www.bahn.com.....". I replied that I fully understood seat reservation is not available for the Swiss section, just asking what to do with the German section and they wrote back, "if you are booking reservations, will cost 4.5 euros a seat on 2nd class...." In short, they didn't answer my question.
I called local DBahn agency. After checking they said they have no idea whether this can be done later as they got the same info as shown on DB website.
Has anyone come across similar situation before? If i bought online tickets now, how can I reserve seats later?
Advice appreciated. Tks.