- You've got everything you want except the most important thing.
- What's this?
- A girl.

5 seconds sound clip from the White Christmas (1954) movie soundboard.

You can hear this line at 00:15:38 in the Blu-ray version of the movie.

Quote context

[...]

- You're whacky. I'm a very happy man.

- Well, then, you're happy for the wrong reasons. And that's the same as being lonely and miserable, except it's worse.

- You know something, you're off your nut about a mile and a half.

- I've got everything in life I want.

- I'm off my nut a mile and a half.

- At least.

- You've got everything you want except the most important thing.

- What's this?

- A girl.

- Well, I'll get around to that one of these days.

- My dear partner, when what's left of you gets around to what's left to be gotten, what's left to be gotten won't be worth getting whatever it is you've got left.

- When I figure out what that means, I'll come up with a crushing reply.

- What's back all this, anyway?

- Nothing. Only your happiness.

[...]