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Could we start a bit later?
I've got a scheduling conflict.
I mixed up the time on my end.
I'm sorry it's such last minute.
It got canceled all of a sudden.
Can we switch the meeting to online?
Let's set a backup date, just in case.
Sorry for keeping you waiting on this.
The time might shift due to the other party.
Thanks for accommodating the sudden change.
An unavoidable obligation came up.
I'll send a reminder, just in case.