[{"role": "user", "content": "Could you please translate the sentence 'I'm not pessimistic' into Italian so I can understand and express the same sentiment when communicating with Italian speakers?"}, {"role": "assistant", "content": "The translation of 'I'm not pessimistic' in Italian is 'Non sono pessimista.'. You can use this phrase to convey that you are not pessimistic when speaking with Italian speakers."}]