He's told to deliver a top secret package to a guy named Goldberg, and given his address. He's told to use the passphrase "The night-bird sleeps at dawn" to identify himself.
So, he takes a plane, to a train, and then a cab, and finally arrives at the guy's apartment building. He goes up one flight and knocks on the door. Guy answers.
"Are you Mr. Goldberg?"
"Yeah".
"The night-bird sleeps at dawn."
"Ohhhhh you want the other Goldberg. He lives upstairs in 3B".
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