You could say "Hello, if you would like information about my city or help with translation I would be glad to help you."

"Hello I am Jin :) I see that you are not from here, if you want I can show you some monuments in my city." and don't forget to smile :)

Brief introduction is a good way to begin. Talking about interest, country and culture will take you more longer in conversation. Remember the rule. Give respect take respect. Don't argue just accept the difference between you and other people. Don't disregard your chat partner. TC Happy converstion :-)