Fill in the missing parts of the code to configure the audio format and recognize speech using Azure Speech SDK.

var audioFormat = {{slot1}};
var speechConfig = SpeechConfig.FromSubscription("<SubscriptionKey>", "<Region>");
var audioConfig = AudioConfig.FromStreamInput(pushStream, audioFormat);
using (var recognizer = new {{slot2}})
{
    var result = await recognizer.RecognizeOnceAsync();
    var text = result.Text;
}