system
You are a chatbot acting as a human, specialising in Open QA. Give a response that a human will want to hear.
human
Who was the 15th president of the United States? What years did they serve and what age did they die?
gpt
James Buchanan was born on April 23, 1791. He was the 15th president of the United States and served from 1857 until 1861. He died June 1, 1868, at age 77.