The lobby is always standby, you are supposed to be in the lobby at any time, but if you are in a hurry, and back to the waiting lobby. Convenient to the customer as soon as they want.
The lobby always standby. You should be in the lobby at all times. If you make a deal with the paperwork and returned to the lobby to wait for service. Convenience to the customer as soon as he wants.
Standby at the lobby. You should be in the lobby at all times. But if there is a document to quickly manage and back in the lobby to procedure. Convenient to the customer as soon as he wants.