All three dialogues are available from the start.

1. Date
2. Birthday Gift
3. The Arcstone

The first three dialogues are available from the start.

4. Yasmin's Vanishing
5. Rescue
6. Sluggish Investigation

7. Suspicious Amulet

• Available after putting the amulet on the table and noticing Kaspar

8. Repository Spellcrystal

• It seems to be automatic even though it's listed as an option by the game

The first five dialogue options are available from the beginning.

8. This place
9. Kaspar and Yasmin
10. Injury
11. Frost Moonling
12. Suspect

13. Azar is the Kidnapper

• Available after finding Azar's robe on a table on the right

14. Anti-magic Sphere

• Available after entering the next room and noticing the anti-magic sphere

15. Ritual

• Available after solving the puzzle on the right and reading the note about the ritual

16. Give the Revitalizing Balm

• Available after preparing the healing balm - talk to Kaspar instead of giving him the item

All dialogues are available right from the beginning.

17. Azar's Scheme
18. The Moondial
19. Third Moon
20. Bakhtak
21. Curse of Stone