I know it may seem surprising to people, but learning dialog that has a conversational flow to it is not that difficult.
“We ourselves feel that what we are doing is just a drop in the ocean. But the ocean would be less because of that missing drop.”
“'Batman' took 10 months to film, and by the time I stopped working on it, it took a long time before my English accent came out again. I was actually having to try for it.”