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