What is the correct etiquette when sharing a table with strangers?

Like in the type of place food court shared table restaurants eg Asian. When there are no tables available by self. Do you just sit? Are you expected to have a conversation with your new table friend? If so why would some not talk so much to you, when you ask about their food and them? Do they expect you join... show more Like in the type of place food court shared table restaurants eg Asian. When there are no tables available by self. Do you just sit? Are you expected to have a conversation with your new table friend? If so why would some not talk so much to you, when you ask about their food and them? Do they expect you join in/listen to their conversations when at same table?
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