URGENT 15 PTS
when describing a thing should I use il est or c'est?

I know when describing a person you use il est
example: il est grande

but if I was talking about a thing do I use c'est?
example c'est grand

Sally was visiting france and on a tour with one of her friends that live in paris. her friend, chloe bumped in the someone she must have known and they started talking. sally wanted to ask them is they were friends and how they meet but she forget how to say it it french. how do you say, hi my name is sally, are you friends with chloe in french