Validate time in relation to a checkbox is checked or not?

I have 3 input fields (reservationdate, starttime, endtime) and 1 checkbox (holeday). If the checkbox clicked I do not need starttime and endtime. On the other hand starttime and endtime is required. What can I do to solve this task?

I tried in Laravel the required_if validation-function. But I'm certainly using it wrong

ReservationController store:

    $data = $request->validate([
            'userid' => 'required|numeric',
            'vehicleid' => 'required|numeric',
            'budgetid' => 'required|numeric',
            'reservationdate' => 'required|date',
            'starttime' => 'required_if:holeday,on|date_format:H:i|before_or_equal:endtime',
            'endtime' => 'date_format:H:i',
            'holeday' => 'boolean'
        ]);


index.blade.php (only the checkbox)
            <div class="input-field col s2">
                <label>
                    <input type="checkbox" name="holeday" class="filled-in"  />
                    <span>Hole Day</span>
                  </label>
             </div>

If the checkbox is checked I get the error-message "The starttime field is required when holeday is on." but in this case I need no error. Hey user it is OK. I don´t need a starttime or endtime. Your clicked the holeday.