I'm pretty sure I left out a line. It's been bugging me ever since I posted last time where this line could possibly go, but I think I finally have it figured out. Correct me if I'm wrong.

Vader: This facility is crude, but it should be adequate to freeze Skywalker for his journey to the Emperor.
Piett (I think, or it could be some random flunky): Lord Vader. Ship approaching, X-Wing class!
Vader: Good. Monitor Skywalker and allow him to land!
Lando: Lord Vader, we only use this...

And continuing on from there.