This girl asked if I said something to her when I didn't and it was in restaurant. She keeps reasoning to talk to me and looks every time I pass by?

How shall I pursue her in such circumstances. We are staying in a hostel where this happened and she is staying with her friends in dorm downstairs.
This girl asked if I said something to her when I didn't and it was in restaurant. She keeps reasoning to talk to me and looks every time I pass by?
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