That was not in the script.
2 seconds sound clip from The New Adventures of Winnie the Pooh - Un-Valentine's Day (S2E5).
You can hear this line at 00:17:49.480 in the Blu-ray version of the TV Series.
Quote context
[...]
- To me?
- ...am Cupid, bringer of love.
- I am Cupid, bringer of... Oh, my.
- Where does the script say orchestra blows away? Where?
- Kanga... I give you these... Oh, bother.
- Oh, isn't that sweet? Thank you, dear.
- I must not have read the script closely because I don't remember this part.
[...]