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Sorry for jerking you around with my schedule.
That day's tricky, but I'll try to work it out.
Can I tentatively hold that slot?
I may have packed my schedule too tight.
It hinges on the other party, so it firms up tomorrow.
If it's not urgent, can we push it to next week?
It'd help if we could move it earlier.
My schedule's tight; there's no wiggle room.
If changing is hard, don't force it.
The timing's unpredictable, so leave some buffer.
Sorry for the sudden ask; does it work for you?
Thanks for graciously accepting the change.