Providing you know the username of the user you want to track you might want to try:
Code:
select a.username,
b.last_load_time,
b.sql_text
from v$session a,
v$sql b
where a.username = 'USERNAME_YOU_WANT_TO_TRACK'
and a.sql_address = address
order by b.last_load_time desc
;
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.