The context of the following conversation is It was time for the performance at the stadium. Casey tied sashes together.:
Casey says I feel a little bit nervous about the performance  but I have been practicing hard..
The friend responds I can tell. You seem to know every line by heart..
Casey responds My little sister helped me practice all this week after dinner..
The friend responds That's so nice of her. Do you think you will repay her?.
Casey responds I think I might buy her a new videogame that she wants for her birthday..