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