@Heather573: Go to the guest's message thread. Click the "Change or Cancel Reservation" found about midway down the left column. On the next screen click the Change Reservation box. The next screen allows you to extend the dates as well as put in a price per night. In this way you can provide the discounted price. Once you complete the prompts your guest will receive an email to accept the alteration. Thier credit card is automatically charged if they accept it.