Inventory is gathered by computer not user.  Find which PC this person is using then get a report from the computer.  There should be some canned reports for hardware and software inventory by computer:

look for:

Installed software by computer

The only canned user report on 7.1 SP2 is for local User Account Information. 

If you need specific user information, a custom report can be written and the KB attached can assist you in that process:

http://www.symantec.com/docs/HOWTO63547

Assuming the user in question is the primary user for the hardware you search, you can try this report I created. Its based on the Primary User by Computer and now can be used to deliver info on computers where a user is the Primary User and will also show all installed software from add/remove inventory. Import under reports. If you need more detailed hardware informations you would need to join more inventory tables.