- Julia, dear, this is Nick and Susan. I told you about them.
- How do you do?
- And Mr. Seton.

5 seconds sound clip from the Holiday (1938) movie soundboard.

You can hear this line at 00:58:47.092 in the Blu-ray version of the movie.

Quote context

[...]

- Just a moment, sir. I want you all to come down now. It's nearly 12:00. We want the entire party together to see the New Year in.

- The New Year comes into this room too, Father.

- You've caused quite enough trouble for this evening.

- Look here, Father, if I want to see the New Year in as I had planned, as I had asked you ‒

- I think, if you don't mind, we'll go down and see what's happened to the furnace.

- Julia, dear, this is Nick and Susan. I told you about them.

- How do you do?

- And Mr. Seton.

- Oh, your friends are always welcome here, Johnny.

- Nick, look, I'll see you downstairs.

- Oh, why, thank you, Johnny. But as a matter of fact, Susan has the most awful run in her stocking...

- Why don't you go down to my room? It's on the third floor.

- Oh. Oh, fine.

[...]