there arent correct responses. these effect the date scene later on in the gold saucer.

if your nice to tifa you date her.

if your ignorant to tifa and nice to aeris you date her.

if you ignore tifa and aeris you date yuffie.

if your completely ignorant you date barret (its not a proper date and barret and cloud are not gay. its just some sort of talk about buisness.)

i usually act nice to everyone because when playing FF i find it so hard to be a jerk.