With reference to your request that you advance the shipping schedule by one week, we'd like to maintain the present one as there would be much possibility that the ordered parts are unable to meet it. Your kind understanding would be much appreciated.
様々な表現が可能だと思いますが、きちんとした返事としては、
With reference to your request that you advance the shipping schedule by one week, we'd like to maintain the present one as there would be much possibility that the ordered parts are unable to meet it. Your kind understanding would be much appreciated.
一週間スケジュールを前倒しされたいということに関しまして、私共は現状の予定を保持したいと考えております。というのは注文部品が間に合わないと危惧されるからです。
ご理解いただけることと存じます。
日本 
