there isn'tJapanese often expresses "I don't have" by saying that a thing simply doesn't exist, using ない (nai). Adding よ (yo) at the very end is how Japanese lets the listener know you're telling them something important, much like we use tone of voice or add "you know" in English. For example, 時間がないよ (jikan ga nai yo) is literally "there isn't time, you know," which naturally means "I don't have time!"