app.component.ts

sendMessage(e: SendMessageEvent): void {
    const message = e.message;
    if (!this.user.name) {
        this.user.name = message.text;
        let newMessage = Object.assign({}, message);
        newMessage.text = `Welcome to the chat ${message.text}!`;
        newMessage.author = this.bot;

        this.messages = [...this.messages, newMessage];
    } else {
        //TODO: add code to send message in real-time
    }
}