Using "please," "excuse me," "may I," "sorry," or "thank you" is mandatory. Direct questions without formal salutations might put foreigners off.
Do not ask personal questions
Do not make any personal remarks or ask them any personal questions during your interaction. Doing so can make them uncomfortable and doubtful.
Do not engage if they are unwilling to converse
It's important to decipher if people are up for a chat. You can check so by passing them a smile, greeting them, and talking about the weather.
Don't rush or overshare
Asking too many questions, oversharing, or getting them to overshare may make the interaction uncomfortable, very mundane, and soon to die.
Don't interfere in their personal matters
Refrain from interfering in their personal matters. You should avoid giving unsolicited pieces of advice, suggestions, judgments, and opinions unless asked.