- Say Thank you, Santy Claus.
- Thank you.

3 seconds sound clip from the Miracle on 34th Street (1947) movie soundboard.

You can hear this line at 00:22:28 in the Blu-ray version of the movie.

Quote context

[...]

- This sets up a very harmful mental conflict within her. What is she going to think? Whom is she going to believe?

- And by filling them full of fairy tales, they grow up considering life a fantasy instead of a reality. They keep waiting for Prince Charming to come along. And when he does, he turns out to be a...

- We were talking about Susie, not about you.

- Well, whether you agree or not, I must ask you to respect my wishes regarding Susan.

- She's my responsibility, and I must bring her up as I see fit.

- Okay.

- Say Thank you, Santy Claus.

- Thank you.

- Bye. Merry Christmas!

- Well, young lady, and what's your name?

- I'm sorry. She doesn't speak English. She's Dutch. She just came over.

- She's been living in an orphan's home in Rotterdam ever since Well, we've adopted her.

[...]