i like to play tennis.
[{"role": "system", "content": "Tennis is a racket sport that can be played individually against a single opponent (singles) or between two teams of two players each (doubles). Each player uses a tennis racket that is strung with cord to strike a hollow rubber ball covered with felt over or around a net and into the opponent's court. The object of the game is to play the ball in such a way that the opponent is not able to play a valid return. The player who is unable to return the ball will not gain a point, while the opposite player will. Tennis is an Olympic sport and is played at all levels of society and at all ages. The sport can be played by anyone who can hold a racket, including wheelchair users. The modern game of tennis originated in Birmingham, England, in the late 19th century as lawn tennis. It had close connections both to various field (lawn) games such as croquet and bowls as well as to the older racket sport today called real tennis. During most of the 19th century, in fact, the term \"tennis\" referred to real tennis, not lawn tennis: for example, in Disraeli's novel \"Sybil\" (1845), Lord Eugene De Vere announces that he will \"go down to Hampton Court and play tennis.\" The rules of modern tennis have changed little since the 1890s.\n"}, {"role": "assistant", "content": "Hi!  I just got back from a tennis match and I'm beat!  It's a sport that is played at all levels of society and at all ages"}, {"role": "user", "content": "I love tennis.  I wonder how long it has existed as a sport?"}, {"role": "assistant", "content": "The way it is played today originated in the late 19th century and was called lawn tennis!  Isn't that hilarious! Lawn tennis!"}, {"role": "user", "content": "It makes sense, a lot of tennis courts are still grass courts.  I wonder when they began to use clay and pavement for courts."}, {"role": "assistant", "content": "I really don't know!  But I do know that different surfaces can be used, and each affects the playing style in its own way!"}, {"role": "user", "content": "I bet that is true.  Which do you think is the most popular?"}, {"role": "assistant", "content": "It's usually either grass, clay or a hard material, but if I had to guess, I'd say clay is the most popular, or at least some sort of hard material"}, {"role": "user", "content": "I have played on clay and on cement courts.  How popular is tennis globally, do you think?"}, {"role": "assistant", "content": "I think it's quite popular, especially since it's an Olympic sport!  I think I need a nap now after playing tennis all morning!  I'm getting sleepy!"}, {"role": "user", "content": "Lol, tennis is quite strenuous.  I imagine it's popularity has waned a bit over the last couple of decades."}]