Почему не работает форма в Django?

Question

[Mortty]

Не сохраняется форма в админку

forms.py
def main_page(request):
    if request.method == 'POST':
        reservation = UserReservationForm(request.POST)
        if reservation.is_valid():
            reservation.save()
            return redirect('/')

class UserReservation(models.Model):
    mobile_regex = RegexValidator(regex='^(\d{3}[- .]?){2}\d{4}$', message='Phone format in xxx xxx xxxx')
    name = models.CharField(max_length=50, unique=True, db_index=True)
    email = models.EmailField(max_length=250)
    phone = models.CharField(max_length=15, validators=[mobile_regex])
    message = models.TextField(max_length=500, blank=True)
    date = models.DateTimeField(auto_now_add=True)
    is_processed = models.BooleanField(default=False)


models.py