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Unfortunately, I won't be able to come to the party.
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Unfortunately, I won't be able to help you today.
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Unfortunately, I won't be able to finish this now.
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Unfortunately, I won't be able to see you on Sunday.
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Unfortunately, I won't be able to buy that car.
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Unfortunately, I won't be able to attend the meeting due to a prior commitment.
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Unfortunately, I won't be able to complete the report by the original deadline.
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Unfortunately, I won't be able to provide the information you requested at this time.
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Unfortunately, I won't be able to join the team for dinner tonight.
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Unfortunately, I won't be able to accept the job offer as it is.
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Unfortunately, I won't be able to facilitate the workshop due to unforeseen circumstances.
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Unfortunately, I won't be able to accommodate such a significant change in the scope.
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Unfortunately, I won't be able to authorize any further expenditure this quarter.
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Unfortunately, I won't be able to represent the firm at the upcoming conference.
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Unfortunately, I won't be able to provide a definitive answer until the audit is complete.