Task: Question Answering
Input (English): Passage: Cinderella and the Prince are having a picnic to celebrate their one-year anniversary. Meanwhile, at the Tremaine mansion, Cinderella's stepsisters Anastasia and Drizella are bitterly doing Cinderella's old chores. Anastasia wanders off to avoid work and stumbles upon the picnic. When the Fairy Godmother drops her wand, Anastasia takes it to her mother. In the ensuing struggle, Anastasia inadvertently turns the Fairy Godmother into a garden gnome.
Lady Tremaine, reveling at yet another chance to ruin Cinderella's life, uses the wand to go back in time to the day the Grand Duke fitted the glass slipper on Cinderella. She uses the wand to expand the slipper so that it can fit Anastasia, and the Grand Duke declares she must be the girl the Prince is looking for. Cinderella arrives on the scene too late, and Lady Tremaine destroys Cinderella's other slipper – the only clue to her identity that she was the girl who danced with the Prince on the night of the ball. Cinderella decides to follow Lady Tremaine and her stepsisters to the palace with Jaq and Gus.
At first the Prince claims Anastasia is not the girl he danced with at the ball, but Lady Tremaine uses the wand to alter his memory, and he accepts Anastasia as his bride. Jaq and Gus witness this and inform Cinderella that Lady Tremaine has the Fairy Godmother's wand. Cinderella poses as a maid to get into the Tremaines' room, but she is spotted by Lady Tremaine and captured by the palace guards as an intruder. Cinderella briefly touches the Prince's hand and he begins to recognize her, but Lady Tremaine orders Cinderella placed on the next ship out of the kingdom. The mice find the Prince and explain the whole story to him, and he rides off to intercept the ship just as it leaves port. The Prince embraces Cinderella and his true memories return. He asks her to marry him, and she accepts. 
Question: What is the name of the girl that the Prince danced with at the Ball?
Output (English): Cinderella.