I disagree, it's really downright stupid when you can't ask a NPC same question two times, or return to previous topic. Human conversation doesn't work this way.
Human conversation also doesn't work like
"Welcome, stranger."
"Good day. I need a powerful wizard to help me in my quest. I was told to ask at this village."
"Aye, stranger. Whoever told you that was surely referring to that accursed Killbad."
"Who is Killbad?"
"He is the evil wizard who plagues our people with nightmares."
"Why does Killbad plague your people with nightmares?"
"His daughter came to this village, and someone killed her. Nobody knows who, so he punishes us all."
"Who do you think killed his daughter?"
"She flaunted her magic, and many of us simple villagers were scared. Belar the blacksmith got drunk and declared that she would kill us all. I worry that he may have done it."
"Where can I find Killbad?"
"He must be near the village to cast his spell. Nobody has tried to find him yet, but I think he is staying in the abandoned fort to the east."
"Why does Killbad plague your people with nightmares?"
"His daughter came to this village, and someone killed her. Nobody knows who, so he punishes us all."
"I need a powerful wizard for my quest. Maybe if I can convince Killbad to come with me he will leave you in peace."
"Perhaps. It is likely the only way you could convince him would be to find his daughter's killer."
"Who do you think killed his daughter?"
"She flaunted her magic, and many of us simple villagers were scared. Belar the blacksmith got drunk and declared that she would kill us all. I worry that he may have done it."
"Why does Killbad plague your people with nightmares?"
"His daughter came to this village, and someone killed her. Nobody knows who, so he punishes us all."
"Where can I find Killbad?"
"He must be near the village to cast his spell. Nobody has tried to find him yet, but I think he is staying in the abandoned fort to the east."
"Who is Killbad?"
"He is the evil wizard who plagues our people with nightmares."
"Show me what you have for sale."
"The best weapons and armour at the most reasonable prices, stranger!"