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Could you let me know when you're free?
Could you let me know how many are coming?
Could you let me know what you need?
I'd like to leave a little early, if that's okay.
Could you let me know which you prefer?
I'd like to change the date, if that's okay.
Could you let me know if this is okay?
I'd like to ask one thing, if that's okay.
Could you let me know what time works?
I'd like to come by later, if that's okay.
Could you let me know if you can make it?
I'd like to borrow this, if that's okay.