Conversation so far:
Who was the first person to help Sakis Rouvas?
Dakis, a popular Greek artist, was the first person to help Sakis Rouvas professionally.
Did Salis Rouvas move to another city in search for a better future?
Sakis Rouvas left Corfu at age 18, moving to Patras in search of a better future.
What did Sakis Rouvas do next, after moving to Patras?
After moving to Patras, Sakis Rouvas continued to look for performance opportunities until he met Dakis, a popular Greek artist who was the first person to help him professionally.
What did Dakis do to help Sakis Rouvas?

Question: Which executive noticed his showmanship at the Show Centre in Athens?
Self-contained rewrite: Which executive noticed Sakis Rouvas' showmanship at the Show Centre in Athens?