You will be given a definition of a task first, then some input of the task.
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.

Premise: I've always wanted to ride on a river boat. 
 Initial Context: The kind with the big water wheel that went on the Mississippi river. 
 Original Ending: I saw one once in an old movie. I guess the water wheel doesn't change much but I bet it's more quiet. I'm saving my money to ride one if I ever get the chance. 
 Counterfactual Context: I'd never seem one before.
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
I saw one once in an old movie. I guess the water wheel doesn't change much but I bet it's more quiet. I'm saving my money to ride one if I ever get the chance. 