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Let's keep both options open for now.
I may have packed my schedule too tight.
Sorry for jerking you around with my schedule.
If it's not urgent, can we push it to next week?
Can I tentatively hold that slot?
My schedule's tight; there's no wiggle room.
It hinges on the other party, so it firms up tomorrow.
The timing's unpredictable, so leave some buffer.
It'd help if we could move it earlier.
Thanks for graciously accepting the change.
If changing is hard, don't force it.
Let's put it on hold and see how things go.