The phrase "a confirmation number" is correct and usable in written English.
You can use it when referring to a unique identifier provided to confirm a reservation, order, or transaction.
Example: "Please keep your confirmation number safe, as you will need it to check in for your flight."
Alternatives: "a booking reference" or "an order ID."
From: OnTrack ResearchDate: Thursday, Feb. 10, 2011 at 5 30 A.M.Subject: Confirmations - Spiderman - Turn Off the Dark - February 2011 Hi Everyone,For those of you who called, do not assume you are confirmed unless you have been given a confirmation number, you will not be allowed in without one.
Once the representative confirms that your payment has been canceled, ask for a confirmation number and be sure to write it down.
It contained a confirmation number for a Delta Airlines flight.
Will I get a confirmation number that payment was accepted?
A confirmation number is usually supplied via e-mail or directly on the screen.
You will receive a confirmation number upon completion of the form.
When you are looking for something, you are often looking for one thing: A flight confirmation number, an invitation to dinner, a bank statement.
Typically, Hotel Reservations Network takes a traveler's credit card number by phone, forwards the reservation to the hotel, gives the traveler a hotel confirmation number (so a traveler can double-check his or her reservation with the hotel) and mails or faxes a voucher to the traveler affirming the transaction.
Then they can redeem the deal with their phone, which will show a barcode, confirmation number or send an SMS (whatever the merchants' preferences are).
Once this is done, the representative will give you a "cancellation confirmation number," which you need to take a note of for future reference.
So I canceled via e-mail and received a cancellation confirmation number.
