Yes, Mrs. Walker.

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

You can hear this line at 00:24:49 in the Blu-ray version of the movie.

Quote context

[...]

- I mean your real name.

- That is my real name.

- Second grade.

- It's a progressive school.

- Oh. It's a progressive school.

- May I have this gentleman's employment card, please?

- Yes, Mrs. Walker.

- This dress is very cute. Where did you get such a lovely outfit?

- Here at Macy's. We get 10 percent off.

- Please don't feel that you have to keep pretending for Susan's benefit.

- She's a very intelligent child and always wants to know the absolute truth.

[...]