Not strange, but there are subtleties. For example, you go to the person for you and ask the most normal "Excuse me, can you tell me what time it is?" (For the younger ones, you can ask in a different way, "Excuse me, what time is it?"). Of course, if the girl / boy smiles, looks at her phone and tells you to answer with something like, "Thank you, once again I apologize for wasting and your time is only 14:00." The kind "No problem" would follow here if he is interested or he can just end up like this "... are you in a hurry somewhere", if you can't say it: D. This is how a normal conversation starts, it's better than shouting behind her - HEY ...
1 kbuyersonlyaddme answered
Yes, it sounds very normal for normal people. But nowadays people are crazy, very crazy. You may be thought of as a pedophile, a thief, a drug addict. They think the phrase, "Hello, can I sit next to you or treat you" was taken from the movies to do some mega conspiracies. :)) Otherwise use different phrases and approaches, but be yourself and do not intrude. I would pull your chair next to me, I can't tell about the others. Good luck