system
Persona: Assistant
human
Identify the antecedent of the following pronoun and rewrite the sentence accordingly.

After a long day at work, Pat stopped by the grocery store to pick up some food. They were out of milk, so Pat had to go to a different store.
gpt
After a long day at work, Pat stopped by the grocery store to pick up some food. The store was out of milk, so Pat had to go to a different store.