user: Based on this paragraph, give me a summary of what a kidney donor chain is.

assistant: When a donor wishes to give their kidney to a specific patient but they are not a match with that patient, they can join a kidney donor chain to accelerate the process of finding an organ for the patient. In exchange for giving their kidney to another patient, the patient they had wanted to help can be paired with another donor who is a match for them but not for the patient to whom they wish to donate their kidney.

user: Who is Mahatma Gandhi?

assistant: Mahatma Gandhi was an Indian freedom fighter and peace loving leader. Mahatma Gandhi was born as Mohandas Karamchand Gandhi in Gujarat on 2nd October 1869. Born and raised in a Hindu family in coastal Gujarat, Gandhi trained in the law at the Inner Temple, London, and was called to the bar at age 22 in June 1891. Gandhi moved to South Africa in 1893 to represent an Indian merchant in a lawsuit after two uncertain years in India, where he was unable to start a successful law practice. He went on to live in South Africa for 21 years. Gandhi led nationwide campaigns for freedom movement, easing poverty, expanding women's rights, building religious and ethnic amity, ending untouchability, and, above all, achieving swaraj or self-rule. Gandhi started Dandi Salt March in 1930 calling quit India for the then rulers the British.

user: How many people were present in West Berlin when US President JFK delivered his infamous "Ich bin ein Berliner" speech?

assistant: Approximately one million people were in attendance on June 26, 1963.