Language Learning Dialogue Generator — illustrative example

INPUT
Beginner French learner wants a short dialogue about buying a train ticket.

RESULT
Voyageur : Un billet pour Lyon, s'il vous plaît.
Agent : Aller simple ou aller-retour ?
Voyageur : Aller simple.
Explain aller simple as one-way and let the learner repeat the exchange with another destination.

REVIEW
A learning dialogue should use natural turns at the requested level. Give the speakers a clear goal, reuse target vocabulary and explain unfamiliar expressions without making every line a vocabulary list.

This is a teaching example, not a live execution record.