So I'm afraid I'll have to beg off.
4 seconds sound clip from the Breakfast at Tiffany's movie soundboard.
You can hear this line at 00:25:34 in the Blu-ray version of the movie.
Quote context
[...]
- If we're going to be friends, let's just get one thing straight right now. I hate snoops.
- I've been trying desperately to reach you.
- Bill just got back. A day early, the beast.
- So I'm afraid I'll have to beg off.
- You'll explain to the rest of the girls?
- You're a darling. Maybe we can have a long lunch tomorrow.
- I'll phone you in the morning.
[...]