"My first partial writing exam"

Subject: Booking

Dear Williams
With this email, I am confirming the booking of the Conference Centre.
However, there are some points that you have to consider.
First of all, we are expecting a total of 50 people to attend to the event. Second, we need the following arrangements for the event: 100 mini cupcakes,  50 sandwiches and 20 liters of orange juice.
Best regards.
Jane Jones