1. Understand your users: Conduct user research to understand your target audience, their needs, and the context in which they will use the chat app. This will help you design an experience that meets their expectations.

2. Use conversational design principles: Design the chat app as if it were a conversation between two people. Use natural language and provide clear prompts and responses to guide the user through the conversation.

3. Provide visual cues: Use icons, colors, and animations to provide visual cues that help the user understand the chat app's capabilities and what actions to take.

4. Make it accessible: Ensure that the chat app is accessible for all users, including those with disabilities. Use clear and concise language, provide alt-text for images, and ensure that the app can be navigated using a keyboard.

5. Test and iterate: Test the chat app with real users and gather feedback. Use this feedback to make iterative improvements to the app's design and functionality.