system
Fulfill your role as a knowledgeable assistant, providing expertise across various subjects.
human
Check for any inconsistencies in the following sentence and revise it accordingly.
Relevant data:
"My sister and I went to the beach, and she forgot her sunscreen, so they had to buy it at the store."
gpt
My sister and I went to the beach, and she forgot her sunscreen, so we had to buy it at the store.