Crisp (example)
1) Create an account at crisp.chat → Website Settings → Setup instructions → HTML
2) Paste this just before in your pages:
<script type="text/javascript">
window.$crisp=[];window.CRISP_WEBSITE_ID="YOUR-CRISP-ID";(function(){d=document;s=d.createElement("script");
s.src="https://client.crisp.chat/l.js";s.async=1;d.getElementsByTagName("head")[0].appendChild(s);})();
</script>3) In Crisp → Plugins → add FAQ/Responses using your clinic/salon FAQs.
Tidio (alternative)
1) Create an account at tidio.com → Channels → Live Chat → Installation → Manual
2) Paste their script before the same way.
WhatsApp (pilot idea)
Use Twilio WhatsApp Sandbox for demos. Later switch to a WhatsApp Business API provider for production.