You received some very good advice in these answers. They are all correct in stating the Seller's agent is responsible for carrying out the Seller's wishes, even if they want to continue negotiating on asking-price offers.
If you are not already doing so, you would be wise to engage a Buyers Agent on your behalf. It costs you nothing and they can help explain and guide you through all the confusing nuances of buying a home. All of the respondents here would be excellent choices and you won't go wrong contacting any one if them.
Good luck! -Tim