an one-on-one vs a one-on-one

Some examples from the web:

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Some examples from the web:

• I need a one-on-one with the Guatrau.
• This is just meant to be a one-on-one.
• But then he heard I had a one-on-one with the New York Times, - and, boom, he was on board.
• I'm not asking for a one-on-one with the president, but... the Secretary of Labor, Treasury, one of his economic advisors.
• I secretly scheduled us a one-on-one with Madeline's boss, chief fisker.
• Soon as he's free, Dekker used his contacts to set up a one-on-one with Roman.
• She was one of the guests that got a one-on-one with Barry afterwards.
• I called MacKenzie and told her that Jim gave away a one-on-one with the candidate to another reporter on the bus.
• You're in luck, I got you a one-on-one with Faraj.
• A one-on-one with the man himself in the oval office.
• Followed by a one-on-one dinner with Baryshnikov.
• Me and Nikki have a one-on-one ratio.
• Everyone will be having a one-on-one with me later.
• She was one of the guests that got a one-on-one with Barry afterwards.
• Followed by a one-on-one dinner with...
• I think I need a one-on-one with Reverend Deveaux.
• The next day Michael sat down for a one-on-one meeting with Ron Howard at Imagine.
• You need a one-on-one, I'm around.
• I'd also suggested a one-on-one for the flight.
• I need a one-on-one with the Guatrau.