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The time might shift due to the other party.
It got canceled all of a sudden.
An unavoidable obligation came up.
I mixed up the time on my end.
Can I suggest an alternative day?
Could we start a bit later?
Could we push the date back?
That day's tough, but the next day works.
Something came up on my end.
I've got a scheduling conflict.
Sorry for the short notice, but can we reschedule?
I'm sorry it's such last minute.