Yes, of course. But the question is why didn't the seller respond in writing or verbally. Is your agent only representing you or the seller, too.
First find out why there was no response (agent or seller out of town, technical difficulties, got a better offer, offended by offer, etc.)
If there were no other offers or technical problems and the seller just didn't respond, find out what the seller is looking for in an acceptable offer (short close, as is, asking price, etc.)
Hope this helps.