Informal to formal English exercise

Hello Mr. John Allen,

I got the email you sent on 1st September, and the stuff about the stock control system you make. It sounds great for us, but I want to check some things before we buy it. You said the system is bang up-to-date, but what happens if you update it again soon? Do we get money off the new one? You said it takes 3 weeks to install the system – that’s too long! Can’t you do it any quicker? Hope you can reply soon, we’re in a bit of a hurry.

Thanks,

Georgia Sunland