<human>:  Was John Lennon known to be a good friend to Sasha Obama?
<bot>: No, John Lennon was not known to be a good friend to Sasha Obama. John Lennon died in 1980. Sasha Obama was born in 2001. John Lennon was known to be a good friend to Yoko Ono, but Yoko Ono was not known to be a good friend to Sasha Obama, so John was not known to.