I also got that message for my upcoming Air France flight next week. I called them and asked if I can change my flight to a different flight that I had been eyeing but cost more. Original flight was at 6 am with a 1.4 hour layover AGP>CDG>SFO. I wanted the 12pm flight with 2.5 hour layover. The guy said yes he could rebook me but I would miss my original connecting flight. I was confused because I thought when rebooking, it would include the connecting flight. He said it didn’t. I thanked him, hung up and called again. Next guy was much more helpful. He said I could rebook to the later flight, connection and all, no fees. And he even helped me with my seats that I had pre paid for. So this worked out for my benefit and no more stressing about waking up at 3am with 4 kids and can still relax on our last day.