Thanks for your follow-up. No, I only got one email which listed the reservation status as "confirmed". Even the agent at the ticketing desk at JFK could not understand why the reservation was changed over five weeks later. There were still seats availalbe on the flight I reserved. Possibly just human error.
I think I was more upset by the way it was handled at JFK. All companies make errors. I judge customer service not only by what a comany does right but also by what they do when something goes wrong. In the end I did get the flight I originally scheduled without paying a fee for a change but it was not a pleasant or customer-friendly exchange. And anyway, they falied to get my luggage onto the conneting flight at CDG... but that is another story.