Zhisheng hotel management system, a guest checks out, he checks out with another room, but the other guest doesn't leave. how can I make a phone call?

If the other guest doesn't leave, then we can't check out together, otherwise the guest will continue to stay and can't charge.

Two rooms are open, and those returned should be closed first. If guests want to pay for that room and then charge it to that room through payment, they can place an order separately.

But I use the x8 hotel management system. This one of yours has never been used. I don't know if I can do this.