ATC to Flight 123: "Slow to 300 knots please." After several moments, it was apparent the crew had not complied with the first speed reduction and was overtaking the inbound plane ahead of them.
ATC to Flight 123: "Slow to 280 knots." This was soon followed by a request for 250 knots from ATC when the crew still had not slowed the airplane.
Finally, the now-frustrated controller ordered, "Gentlemen, the number is 250. Either slow to it or turn to it!"