Why do you think Don Octavio del Flores is Dr. Mickler?

Don Juan:
Where is Don Octavio del Flores? Bill:
Wh-who? Don Juan:
My host at this villa. Bill:
Via? Via? Don Juan:
Villa. Bill:
Via? Villa. Don Juan:
Si, villa. Bill:
Villa. Don Juan:
Villa. Bill:
Via. Don Juan:
Where is Don Octavio? Bill:
Y-you mean Dr. Mickler? Don Juan:
Who? Bill:
Um, [clears throat] Bill:
... Why do you think that, um, Dr. Mickler is, um, Don Octavio del Flores? Don Juan:
Why do you think Don Octavio del Flores is Dr. Mickler?