Which expression is more natural in daily life?

Which expression is more natural at a convenience store or supermarket?　A shop staff "Do you need a bag?"


A shop staff  "Would you like some chopsticks?"

A shop staff  "How many servings would you like?"⇒ for chopsticks

A shop stuff "Thank you very much. We look forward to seeing you again."　

ありがとうございました。またの　おこしを　おまちしております。

どうも。またの　おこしを　おまちしております。

Which expression is more natural at a convenience store or supermarket? A shop staff "Do you need a bag?"