A chat interface is a screen where people exchange messages with another person or an AI. It is like a conversation on paper, with each speaker's message shown in order.
An AI chat page usually has a place to write a message and a running list of replies. People need to know when a reply is still being prepared and how to start a new conversation.
Make the conversation easy to follow and let people correct or resend a message when appropriate. When the other speaker is AI, explain that clearly so visitors know what kind of answer to expect.