Hello @Jill187,
Yes, you can do that.
Go to the calendar for your listing and click on the first date for which you want to change the price. A window will then appear on the right. It will have a "Start date" and "End date" box. The start date will already be filled in as the date you clicked on. You can fill in the end date or drag the little "III" symbol on the right ot the calendar's date to include the end date on the calendar.
Then enter the price and click on "Save changes".
Steve.