The Postman Stage 2

"The postman goes to a house on Denver Street. He rings the bell twice.
The old man hears the bell but he can't open the door immediately because he is upstairs...
He opens the upstairs' window and puts his head out and asks loudly:"Who is it? "The postman answers:"Postman."
The old man says to the postman:
"Wait a minute! I'm coming downstairs." "