The web messenger is the Bookboost website chat solution. You can see it below.

The web messenger is usually the first point of contact with your guests. It is where guests can connect to the channel of their choice (provided that you have integrated with said channel).

Integrating the Web Messenger is very simple. 

Go to Settings Channel integrations 

or point your browser to

If you have several websites, first select the one you wish to integrate, then copy the text in the box and place it on the index page of your website.

How this is done will vary based on how your hotel has built the website. You might want to get the developer involved for this.