What it means
The form is part of a conversation: labels explain what to provide, supporting copy sets expectations and confirmation explains what happens after submission. A short form can still collect enough context to make the response useful. More fields should have a clear purpose.
Use it in practice
Ask only for information needed at this stage. Use persistent labels, helpful validation and a clear success message.
Watch out for
Placeholder text is not a substitute for a label. Do not leave visitors unsure whether their message was sent or when to expect a reply.