What to name these Conversation objects in my code

I'm normally pretty ok at naming things in code, but I'm struggling here and would love some new ideas.

I'm building part of a game for the dialog with NPCs. It functions just like Fallout:

• Player initiates dialog with NPC.
• NPC says a few sentences.
• Player gets a list of replies and can pick one.
• Depending what the player picks, either the conversation will end, or the NPC will say some new stuff and start this over.

Here's the names of objects that I have so far that I'm not exactly in love with. I'd love suggestions on any of these.

1. Dialog: This is a "container" object. Clicking on an NPC will start the Dialog. This contains many Chats.
2. Chat: This is the name I dislike most. A Chat contains the text the NPC will say, and a list of ChatReply objects.
3. ChatReply: This contains the text of the reply (what the player is saying back to the NPC), as well as a pointer to either a new Chat, or to end the Dialog.

Any suggestions?

Update: From the replies, I think I like Dialog / Prompt / Reply.