YOU SAID:
forgot the movie title to lunch
INTO JAPANESE
昼食に映画のタイトルを忘れた
BACK INTO ENGLISH
I forgot the movie title for lunch
INTO JAPANESE
昼食の映画のタイトルを忘れてしまいました
BACK INTO ENGLISH
I forgot the title of the lunch movie
INTO JAPANESE
ランチ映画のタイトルを忘れてしまいました
BACK INTO ENGLISH
I forgot the title of the lunch movie
That didn't even make that much sense in English.