I’m sorry to inform you that we will not make the dead-line.
But we’re doing everything we can to sort it out.
Because of problems with our supplier we are behind with production.
We therefore cannot guarantee delivery by August 30.
We offer you our sincere apologies for […]
We shall do our utmost to […]
I might need some more time after all.
I hope you will understand our position.
I’ll soon be in touch with more details.