听力原文：M: Will that be cash or charge? W: I want to pay by check if I may. M: Certainly. That’s cash, then. W: Cash? M: Yes, Both money and checks are considered cash. Only credit cards are charge. W: Oh. M: Just make the check out to the Family Store. W: Okay. M: And l’ll need two pieces of identification. A driver’s license anti a major credit card. W: Well, here’s my driver’s license, I don’t have any charge cards. M: I think so. I need two numbers. Your’ student number is on the ID, isn't it? W: Yes, it is. Do you need anything else? M: Just put your telephone number on the front of tile check. W: Okay. M: Good. Now let me give you your license, your ID, and your package, And thank you for shopping at the Family Store. W: Thank you. What is the purpose of the conversation?