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.
Q: Premise: David went to china with his girlfriend. 
 Initial Context: They went to beijing first. 
 Original Ending: They tried to climb the great wall. David's girlfriend wanted to stop after 20 minutes in. They ended up leaving. 
 Counterfactual Context: They climbed the Great Wall of China together.
A: 
They tried to climb the great wall quickly. But David's girlfriend wanted to stop to rest after 20 minutes. They ended up leaving. 