Final answer:
Moira asked Sebastien to go to the Chateau de Chillon and make arrangements for their visit.
Step-by-step explanation:
According to the given text, Moira specifically asked Sebastien to go to the Chateau de Chillon. The courier inquired if Moira had made arrangements for the visit. This suggests that Moira wanted Sebastien to make arrangements for their visit to the Chateau de Chillon.