Appointment Slots Widget: how to break list with an open space

Hi i've made an easier solution for my two dates i need in my formulier but i was wondering if it's possible to get an open space in the appoitments timeswithout mentioning available

Look at the screenshot. 

Do you mean like this?

Please inject this CSS code into your widget:

li:nth-child(12) {

    margin-bottom: 50px !important;

    border-bottom: 1px solid lightgray;

}

Instructions here:

How-to-Inject-CSS-Codes-to-Widgets