Using the steps listed here, you can use any chat tool that comes with the option of an embed code. Several chat tools can be used to enable great customer service such as Freshchat, Olark, etc. They do offer a large variety of features across different plans and you may choose the plan that best suits your needs. Here are their integration links:
Follow the steps below to setup your account& enable the chat option.
Here's how to enable the chat tool on your site across all pages.
This would enable the chat tool on all your site pages. Once a form is submitted, the information will be available in the tool itself.
Follow the steps to enable the chat tool on a specific page.
Note: To use a basic WhatsApp chat option, learn more here: Whatsapp chat tool on your knorish site.