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OK, First, you need to reread the blog. You should NOT be storing the Transaction_ID. It is a calculated value. Second, your naming is what confused me. Your Passenger table should have an autonumber PassengerID. That PassengerID should be the Foreign Key in your Reservations table. Your servation table should also have an autonumber for ReservationID. I really don’t see why you need sequential numbering in the passenger table. I can understand it in the Reservations table, but not in the passenger table. Also, I don’t see any reason for a transaction date in the passenger table. I can understand a CreateDate for when the passenger signed up.
Changing the numbering display affects how pages are indicated in the InDesign document, as in the Pages panel and in the page box at the bottom of a document window. The numbering display also affects how you specify page ranges when printing and exporting the document. However, the numbering display does not change the appearance of page numbers on document pages.

One of the easiest ways to begin applying numbers is by starting to type a numbered list. Word recognizes that you are creating a list and responds accordingly by converting text that you type into numbered items. The number scheme, delimiter characters that mark the beginning or end of a unit of data and formatting are all based on what you have typed. sequential numbering printing