If you would take a look at this website.
It uses a pretty interesting chat support widget.
How to figure out the company that made this?
Right-click the chat button (in this case, the balloon thingy) and select the option "Inspect Element" (or similar). It is available in most desktop browsers (I tried Chrome, Firefox, Edge, they all had it), and should be available in mobile browsers, as well.
You should see something like
<div class="intercom-launcher-close-icon">. Searching for "intercom launcher" returned this result from a company that offers live chat as a service for websites.
The rationale behind this procedure is that live chat provider usually gives its customers the same piece of HTML code to put on their websites, and this HTML code carries the provider's signature.