If you change your mind about selling your property, you can close your listing early, provided it meets some criteria.
You can change your mind about selling a property at auction only if you haven't accepted (or Flippa hasn't automatically accepted) a bid that's equal to or more than the reserve price on your listing.
Once you've accepted a bid that exceeds your auction reserve price, you're legally obliged to sell the property to the person who made the highest accepted bid. So you can't change your mind about selling at this point.
You can change your mind about selling a property in a private sale at any time before you accept an offer. Once you've accepted an offer in a private sale, you're legally obliged to sell the property to the person who made that offer.
Before you accept a bid or offer, ask the buyer any questions you need to. Take the time to satisfy yourself that the buyer will honour their promises to you regarding the transaction.