You can do dialogues with "LTX 2.3 ID-LoRA with First-Last Frame" workflow from u/ussaaron

Got curious if this works and it does. The woman is using a cloned voice, orc voice is created by LTX 2.3. Changed the original workflow a bit with Claude since no matter how much i update comfyui, it still has subgraphs broken, so unpacked the node and fixed some broken things while doing so with Claude. First image was for the woman, second for the orc. The most obvious issues are some clumsy transitions and that second character can't use a cloned voice for the moment, maybe someone can give that a try.