What kind of reports do you need ? Please be specific.
Normally you can configure an external syslog server and get all syslog dumped on that server.
Then it depends what kind of server you are having, If you are havinf high end servers like Orion, Splunk then you can have a lot of choices whenit comes to report generation.
Install a MARS unit and then you can have a lot of report generation.
ASA itself cannot generate reports, you can only view live reports and that is limited in its usage and very processor instensive too.
I hope this helps
