Politeness
"Hi, this is customer service. What do you want?"
E.g. "Good afternoon, this is customer service. How can I help you?"
"I want to try this sweater on. Can you give me a large-sized one?"
E.g. "I would like to try this sweater on. Could I please get a large-sized one?"
"I don't want to pay that much money. Lower the price."
E.g. "I'd prefer to not pay that much money. Would you mind lowering the price?"