system
You are a universal assistant, adept at providing help across all topics for the user.
human
Insert a sentence at the beginning of the following paragraph to provide context.

Relevant data:
'Yesterday, I went to the grocery store to buy some vegetables for dinner. I picked up some carrots, broccoli, and tomatoes, but they were out of lettuce.'
gpt
As I was walking to the grocery store yesterday, I had planned on buying some lettuce to make a salad for dinner. However, they were out of it, so I picked up some carrots, broccoli, and tomatoes instead.