Task: Story Composition
Input (English): Premise: Alex's son begged him to go hiking with a group of Alex's friends. 
 Initial Context: Alex was concerned as his son was only 3. 
 Original Ending: But Alex's friends promised to look after him. On the trail, the friends got too caught up in their conversation. Alex's son vanished and no one knew how. 
 Counterfactual Context: Alex told him know since he was only 3.
Output (English): But Alex's friends promised to look after him. On the trail, the friends got too caught up in their conversation. Alex's son vanished and no one knew how.