"no one confirmed" is correct and usable in written English.
For example, you can use it in a sentence such as: "We sent out the invitation, but no one confirmed if they were coming."
But no one confirms the rumour that there are different prices for different groups.
But no one confirms the rumor that there are different prices for different groups.
"I have enquired on the matter but no-one confirms the allegation of shooting," he wrote.
The television, which crashed to the ground outside the Oval Office, injured no one, the Secret Service confirmed.
At the time no-one officially confirmed the meeting, but privately Facebook executives alluded to it.
No one has confirmed or denied rumors that ransoms were paid.
No one has confirmed that Mandelson will be doing this job.
Dr. Rollin said that doctors in other countries were investigating possible infections, but no one was confirmed to have the virus.
The Santa Claus story — with the striker in a blue Manchester City hat, incidentally — is believable because it is Balotelli, though no one has confirmed the veracity of it yet.
One curiosity of this situation is that no one has confirmed any cases in the wild of brucellosis transmission to cattle from bison.
