Hi @Jennifer3596 are you referring to altering a current reservation as a Host? Look for an option to modify or alter the reservation, you will find it on the conversation thread you have with your guest. Click on this to initiate the alteration process.
After adjusting the dates, review the changes to ensure they are correct. This includes the new price for the stay, if applicable. Airbnb will automatically adjust the pricing based on your listing’s settings. Once you’ve confirmed the changes, submit the alteration request. This will send a notification to your guest informing them of the proposed change to their reservation. Hope this helps!