That's very thoughtful of you, but I've already made arrangements.

Meaning

Thank you, but I've already planned how to handle it.

Examples

• John: I've booked a table for dinner at that new Italian restaurant.
• Alice: That's very thoughtful of you, John, but <b>that's very thoughtful of you, but I've already made arrangements</b>.
• John: Oh, of course. I completely forgot you had plans.
• Alice: Yes, <b>that's very thoughtful of you, but I've already made arrangements</b> for tonight. Perhaps another time?