I called and asked for the following routing: AMS-FRA-LAX-DEN. I told them I wanted to fly LH instead of Delta, and was given what I asked for.
When I got to the airport however, the agent couldn't find my itin, so she had to make a couple of calls to get it figured out.
Just about missed my connecting flight too, because of the snow at FRA - and my luggage didnt make it either