Each booking made on simpleERB gets automatically given a reference number.

Once a booking is made and saved, a green bar will appear showing the reference number and booking details.
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Online widget bookings will display the booking reference number on the last step of the booking process and it is also listed on the customer's booking confirmation email.
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Telephone bookings entered into the diary can also have an automated booking confirmation email sent to the customer so they have a copy of the booking reference. You can enable this in the Restaurant Info setting > Tick box under the restaurant booking email contact field > Yes, automatically send confirmation email to customer.
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It is also shown on the customers booking email as well as at the top of the booking info screen.