reservations without timeslot

Hi There,

Thanks for developing such a great plugin. It really meets our needs for a booking calandar.
There is only one problem I am dealing with and I don’t know how to solve. When customers are making an appointment, they are able to complete the reservation without selecting a timeslot. Is it possible in any way to make it required for the customer to select a timeslot?

Kind regards,
Robert

The page I need help with: [log in to see the link]