Teacher:Given a premise, an initial context, an original ending, and a counterfactual context, the task is to generate a new story ending aligned with the counterfactual context and as close to the original ending as possible. Each instance consists of a five-sentence story. The premise is the first sentence of a story, and the second sentence, which is the initial context, provides more information about the story's context and the story's general plot. The original ending is the last three sentences of the story. Also, a counterfactual context is a slight modification to the initial context. You should write a new story ending that edits the original story ending as little as possible to regain coherence with the counterfactual context. To sum up, you should write the last three sentences of a story based on the premise(first sentence) and the counterfactual context(second sentence) of the story.
Teacher: Now, understand the problem? Solve this instance: Premise: Ivan wanted to see if he could get enough helium balloons to fly.
Initial Context: The first store he went to had 500 balloons on sale for $400.
Original Ending: He picked out a couple different colors and started filling them. Ivan tied the balloons to himself and said farewell to the earth. Even though he only made it 3' off the ground, he felt free.
Counterfactual Context: The only store he went to had 1 balloon for sale for $1.
Student:
He bought the one balloon. Ivan tied the balloon to himself and said farewell to the earth. Though, he never made it off the ground.