<div class="col-md-6">
<div class="slot_radio ">
<input type="radio" name="time_slot" id="time_slot_1" class="radio" value="1" data-time="1:00 am - 2:00 am" />
<label for="time_slot_1">1:00 am - 2:00 am</label>
</div>
</div>
<div class="col-md-6">
<div class="slot_radio ">
<input type="radio" name="time_slot" id="time_slot_2" class="radio" value="2" data-time="2:00 am - 3:00 am" />
<label for="time_slot_2">2:00 am - 3:00 am</label>
</div>
</div>
<div class="col-md-6">
<div class="slot_radio ">
<input type="radio" name="time_slot" id="time_slot_3" class="radio" value="3" data-time="5:24 am - 5:25 pm" />
<label for="time_slot_3">5:24 am - 5:25 pm</label>
</div>
</div>
<div class="col-md-6">
<div class="slot_radio ">
<input type="radio" name="time_slot" id="time_slot_4" class="radio" value="4" data-time="3:00 am - 4:18 am" />
<label for="time_slot_4">3:00 am - 4:18 am</label>
</div>
</div>