In fact, no REALTOR can sell your house -- or your commercial building or your land. REALTORS don't "sell" real estate. REALTORS market real estate -- they list it, they advertise it, they promote it, they tell people about it, they show it to prospectve buyers, they try to get offers on it -- but they don't sell it. Only you, the owner of the real estate, the title holder, can sell it, can transfer the title to a new owner.
Your REALTOR may bring you offers on your property, and may help by negotiating the offers with the buyers, but only you can sell the property. You must accept an offer, or counteroffer, and must enter into a contract to sell the property to the buyer. Your REALTOR facilitates the transaction, but only you can sell the property. Why am I repeating myself? Because too many sellers don't get it. They won't make their property ready to sell, won't price their property to sell, and won't sell their property when presented an offer or counteroffer.
Everyone knows we are in a depressed real estate market. We have a huge inventory of unsold properties, and only a few qualified buyers. If you are the seller this means that when a qualified buyer offers to buy your property you must be flexible. You must be willing to negotiate -- if you really want to sell your property. It begins with pricing the property; you can price it sell, or you can price it to sit. Your REALTOR can give you some advice on pricing to sell, based on the prices that properties comparable to yours have been selling for. You can take the REALTOR'S advice or not. Price to sell, or price to sit.
When all is said and done -- when your REALTOR has marketed the property according to proven practices, when offers have been presented and negotiated -- only you can sell the property. If your property didn't sell, you chose not to sell it.