fix muna yung href papuntang update booking
ganito ata, href="trip_edit.php?id=<?php echo $row['booking_id'] ?>
if okay na yun
change mo yung $id= $_SESSION['id'];
to $id= $_GET['id']; -> meaning kinukuha mo yung id na nasa url. Example kung ini edit mo yung row ng may booking_id na 77. So...