If you want to collect the information of your guest in database you can do it so by clicking on this tag; Master>Guest. 

As you click on the tag following window will appear to you;

It helps you to keep  customer records either frequent or one who reserves the Table. You can further use this facility to call or greet them in festive seasons or other purposes. They are your mouth publishers.

Security	Transaction	Reports
Stock / Inventory	Other Feature & Utilities	SMS