Customer: If I need help with the computer after I take it home who should I call?
Sales clerk: Please call us. We offer after sales service.
Customer: What is that?
Sales clerk: We are here to help and support you with your new product after you leave the store.
Customer: Is there an extra charge for this service?
Sales clerk: No, not at all. If you need help with installation or operation, please call our store any time.