Conversation so far:
what's the fifth largest city in united states
Phoenix, AZ is the 5th largest city in the US.
what is phoenix arizona's best burger restaurant
Paradise Valley Burger Company is the highest rated burger place on Yelp for Phoenix, Arizona.
what is paradise valley burger company rated on yelp
Paradise Valley Burger Company is rated 4.5 stars out of 5 on Yelp.
when does paradise valley burger company close on friday
Paradise Valley Burger Company closes at 9PM on Friday.

Question: how about on saturday
Self-contained rewrite: when does paradise valley burger company close on saturday