Be her friend and let things develop naturally. Friendships lead to more friendships—and sometimes, they evolve into something more.

If you think she is into, flirt back a little to test the waters! If you’re not sure whether she’s flirting or not, give it time. She’ll make her intentions known in other ways.

If you think she’s being endearing, feel free to use a pet name with her, as well.

Many women say “dude,” just as many men use “hun. ” Gender norms aren’t rules, after all.

While it’s great to be friendly, it’s generally not a good idea to flirt with waitresses or anyone whose job it is to help you. Instead, return the gesture by leaving a good tip—or a good review.

To be on the safe side, avoid calling her “hun” in return. Calling a younger person “hun” can be endearing, but it might be rude when it’s the other way around.

Look out for other clues that point to cultural differences, such as her accent or other word choices. Everyone has an accent, but people from the American South have very particular accents and ways of speaking.

If you’re worried that you’ve upset her, take a step back. Try apologizing if the opportunity comes up. There’s no shame in making mistakes, so long as own up and learn from them. If you’re not sure why she’s upset, give her space. You could also ask a mutual friend or colleague to get their perspective.