Hi, please help me with this practice problem for Accounting Information Systems, help me how to go about it. Thank you!

Practice problem: REA model and tables.

Joes Repair Shop is a shop that provides repair services for cell phones. The shop conducts its business on a "cash-and-carry" basis, with no exceptions. There are always at least two employees (a technician and a sales clerk) in the shop at all times. Customers walk in with their damaged cell phones for repair. A technician assesses the damage (whether it's physical or software-related) and determines whether the technician is proficient in the required repairs and whether the shop has the necessary supplies to undertake the repair.

If the technician decides that Joes Repair Shop can undertake the repairs, the technician makes the repairs and then returns the phone in working condition to the customer within half an hour. The sales clerk rings the customer up for a repair service at which point the customer makes a cash payment before leaving the shop. Because of the extraordinary talent of the technicians at Joes Repair Shop, the technicians have a 100% success rate at repairing the phones. Also, because of the persuasive nature of the sales clerks at Joes Repair Shop, no customer attempts (successfully) to leave without paying.

Joes Repair Shop keeps track of each repair service performed including details about who performed the repairs and who collected the cash. Joes Repair Shop values individual privacy. Thus, Joes Repair Shop does not keep records of customers who come in for repairs but are turned away and have no intention of doing so. Joes Repair Shop does not allow customers to make appointments or pre-payments in advance. Joes Repair Shop also provides no warranties on the work that they perform.

*Provide the REA model, Table of tables, and at least 3 linked tables (or 2 pairs of 2 linked tables for a total of four tables) for the following narrative

Any help is appreciated!