Never ever directly accuse someone of lying. Mostly because it's usually a communication problem where they said it unclear and your heard it wrong. Also because you should always give someone a way out without losing too much face. I would have said something like: Sorry if I gave the impression of not cooperating, but I can assure you I did not and will not take any more pictures this flight. It would mean a lot to…
This is generally helpful advice in many life contexts. I wish Elon Musk had followed it recently.