Honestly, it doesn't really matter what you say. It's mostly about body language and not seeming like a threat (smile). You can talk about whatever. Tell them about a movie you just saw and ask them about recommendations. Ask them for restaurant or dinner suggestions. Tell them about that article you just read which you found intereting.

If they are open to small talk, they will drop some tidbits that you can spring off on. Conversation is a two way street. If they don't seem interested in keeping the conversation going, tell them to have a nice day and carry on with yours.