I did not intend to cancel a guests reservation, it was supposed to be revised
due to an error in the price. The guest accepted this revision and now its showing that I cancelled and now cannot unblock these dates and it will show on my profile? How do I get the reservation back?
You need to contact AirBnB if it is showing that you cancelled the reservation - or, is it showing that the guest cancelled it? Make sure that they stll want to book - perhaps they changed their mind and declined the revised dates and cancelled.