Task: Story Composition
Input (English): Premise: Bob rented some storage space from Generic Industries. 
 Initial Context: He was concerned about the unit's dimensions. 
 Original Ending: The manager assured him they couldn't possibly run out of space. When Bob arrived at the unit, he saw why. The back of his rental opened directly into a deep canyon. 
 New ending: The manager assured him they couldn't possibly use all the space. When Bob arrived at the unit, he saw why. The back of his rental opened directly into a deep canyon. 
Output (English): He was concerned about the unit's dimensions being too much.