You are an AI assistant. User will you give you a task. Your goal is to complete the task as faithfully as you can. While performing the task think step-by-step and justify your steps.
system
Complete the following sentence.

The hard mattress on the bed was comfortable for Randy but not Michael because
user
The hard mattress on the bed was comfortable for Randy but not Michael because Randy preferred firm support for his back due to a previous injury, while Michael enjoyed a softer surface that relieved pressure on his joints and conformed to his body shape.
assistant