Some guests who have booked with you may want to stay longer or cut their trip short. They can make changes themselves but sometimes might ask you if you can make the changes. Follow the steps below to make changes. The guest will have to approve the changes but since they are usually the ones who request them, I can't see why they would not approve them.
NOTE: It is important to understand that when making alterations (also called change requests) that you check everything over before submitting it as the numbers are often not right, sort of. You see, when you make an alteration request, the entire reservation is recalculated with your CURRENT RATES. So, if you lowered your rates and you just take the calculation, you could be receiving a lot less. It is the same as well for the guest. Often, a guest submits an alteration request and they compla that the amount increased hundreds of dollars if they add or delete one night and cannot understand why. This is because it uses your current rates not just for the one night but for ALL nights. So make sure you check out the details and if the amount is incorrect, make it correct in the subtotal box.
Step 1: From the top menu bar, select "Host" and choose "Your Reservations". Find the guest you want to make the changes for and select the "Change or Cancel" link.

Step 2: Find the guest you want to make the changes for and select the "Change or Cancel" link.

Step 3: Select "Change Reservation".

Step 4: You can then change the price of your listing, the listing (if you have more than one), the check-in or check-out dates and the number of guests. IMPORTANT: Make sure you include the cleaning fee and any extra guest charges in the subtotal section. Often this will be calculated in the subtotal but as I mentioned earlier, this recalculates the entire reservation. Once you are happy with the changes, choose "Submit Alteration"

Step 5: Your guest will then be asked if they accept the requested change and if they do, the new changes will be reflected in the reservation.