Alright I got two options for Leia lines when Rey is messing with the bags. I put them both in the same video:
So the first one I like because Leia is basically saying that they have finished the training session for the day. And then Rey responds that actually she DIDN’T finish the course. Feels like a natural conversation.
The second one mostly would be there to let the viewer know who Rey is talking to before the camera reveals Leia.