Re: hlep me make business email formal
Welcome to the forums.
Before I help you, it's important to understand this: At the time the customer placed the order, did you (the supplier) agree to/comiit to the April 7 date? What IS the new arrival date? WHY don't you have the stock you need? Was this an extra order that was not part of your original monthly plan?
You are combining two ideas in this email when you need to focus on one important point: You will not make the shipment date your customer is expecting. Your lack of stock is YOUR problem, not related to your regular production schedule.
I don't understand your "In March" "In April" "In May" chart. Your production time is 30 days and it take 30 days of transit time? Arrival is instantaneous - it does not take 30 days for something to arrive.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.