You can talk about general things: like what is there worth to see in a new city, what are the people like, how is the weather, are there interesting things that happened in a city etc...
and than you can talk about the person, ask him/her about their work, or things they like to do in their free time.. Just be honestly interested in them, and they will be interested in you. People are usually searching for a good listener, not someone who asks a question without really wanting to know the answer.
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