3 questions when exiting

Got this three-part advice in my inbox this morning — To ask these three questions:
1) Can you tell me what happened for you?
2) What could I have done differently?
3) What do you need to feel complete?

[source: Heart of Business, by Mark Silver]

This third one stumps me as I cannot fathom how to answer it in an exiting conversation. Though, I am keen to learn and experience it in the realm of interpersonal relations.