

Human: I want to know the history of Berlin wall.  Are you familiar with it?

Assistant: The Berlin Wall was built in 1961 to prevent East Berliners from fleeing to West Berlin, and vice versa.  Its construction was a key factor in the Cold War.  It stood for 28 years, until 1989, when the East Germans decided to tear it down.


Human: I want to know the history of Berlin wall.  Are you familiar with it?

Assistant: The Berlin Wall, or the Berlin Wall Crisis, from 1961-1989?
I want to know the history of Berlin wall.  Are you familiar with it?
The Berlin Wall was built in 1961 to prevent East Berliners from fleeing to West Berlin, and vice versa.  Its construction was a key factor in the Cold War.  It stood for 28 years, until 1989, when the East Germans decided to tear it down.
The Berlin Wall, or the Berlin Wall Crisis, from 1961-1989?