In React JS, you can define the user persona by passing the `personaOptions` prop to the `AiChat` component.
The `personaOptions` prop is an object with two properties: `bot` and `user`. The `user` property is what you use to
define the user persona, as shown in the example below.

```jsx
<AiChat
    adapter={adapter}
    personaOptions={{
        user: {
            name: 'Alex',
            avatar: 'https://nlux.ai/images/demos/persona-user.jpeg'
        },
    }}
/>
```

The object passed to the `user` property should match the following interface:

```typescript
interface UserPersona {
    name: string;
    picture: string | JSX.Element;
}
```