Thank you, darling.
5 seconds sound clip from the Miracle on 34th Street (1947) movie soundboard.
You can hear this line at 00:42:15 in the Blu-ray version of the movie.
Quote context
[...]
- Yes. Just a moment. Mrs. Shellhammer wants to talk to you.
- I made the martinis triple strength, and she feels wonderful.
- Hello!
- Oh, darling! How silly of me.
[...]