Siri makes it a breeze to dictate a message to someone. Say, “Message person,” and Siri asks what you’d like to tell them. When your dictation is complete, Siri reads back the body of the message and then asks if you’d like to send it, as well as displaying a Send button in some Focus states. However, you can streamline the process. Go to Settings Siri & Search

Automatically Send Messages and enable Automatically Send Messages.
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