<p>Dear [[customer_name]],</p>
    <p>Your service has started!</p>
    <p><strong>Booking Details:</strong></p>
    <ul>
        <li>Booking ID: #[[booking_id]]</li>
        <li>Status: [[booking_status]]</li>
        <li>Service Date: [[date_of_service]]</li>
        <li>Service Time: [[service_time]]</li>
        <li>Provider: [[provider_name]]</li>
    </ul>
    <p>Your service provider has started working on your booking.</p>
    <p>Best regards,<br>[[company_name]]</p>