Alpha Ltd offers an audiovisual equipment hire service. The online sales process is described below.

The customer sends an equipment hire request form containing their name, email address, phone number, dates of booking and equipment required. The Sales Assistant checks the details are fine and sends the form through to the Sales Consultant. The Sales Consultant uses the computer to check whether the equipment requested will be available on the dates required. The Sales Consultant emails the customer to advise them whether or not the equipment is available, and how much the equipment hire will cost. If the equipment hire is not available on their nominated dates, the customer is given some alternative hire dates. The email advises the customer to reply within seven days if they wish to proceed with the hire. The Online Sales Consultant files the hire request form in date order in their ‘Awaiting confirmation’ file.

Required: A logical DFD need to be prepared