adding a day to a reservation

[Nick10]

A guest wants to add a day to  their reservation.  I have gone to 'your reservations' and clicked  on 'change or cancel'......then I changed  the leave  date (adding a day).  The screen automatically changes the total due, then I confirm that I want to save the alterations......then it goes back to the original screen showing the original dates and total due. 

What is supposed to happen?  Shouldn't I get an email saying that the new dates/costs have been submitted to the tenant and I will hear back when it is accepted/declined?

P.S...... My tenant  says she hasn't heard from Airbnb either.

Also, she can't add a single day because I have a two day minimum.

Thanks,

Nick