Is there a way to see which seats are open before booking tickets? I want to make sure asile seats are open before I book:

JFK - DXB Emirates Flight no. EK202
23 Mar 07 11:00 pm departs New York John F Kennedy (JFK)
24 Mar 07 8:00 pm arrives Dubai (DXB) Economy Non-stop
Airbus Industrie A340-500

DXB - JFK Emirates Flight no. EK203
31 Mar 07 2:00 am departs Dubai (DXB)
31 Mar 07 7:50 am arrives New York John F Kennedy (JFK) Economy Non-stop
BOEING 777-300ER