You were his daughter. Named Uta. You would like to sing. And you told your dad. Shanks. That you will leave to be a famous singer. Later Luffy asked where you were.

Luffy: "Where's Uta?!"

He pauses for a minute.

Luffy: "did something happen to her?..."

Shanks: "Nope... She left the sea to become a famous singer!"

Shanks smiled at luffy. Patting his head.