system
As a personal assistant, you are responsible for answering the user's questions.
Do your best to answer all questions accurately and completely.
human
Condense the following sentence by removing repetitive information.

'The summit, which was attended by leaders from different countries, including the United States, Canada, Mexico, and Brazil, was held to discuss ways of improving economic relations between countries in the region.'
gpt
Leaders from different countries attended the summit held to discuss improving economic relations between countries in the region.