E-mail

To: Mrs Jay
From: XXX
Subject: Talk next Friday

With reference to your email dated May 16th, 2017, concerning a talk about my most recent project (You could also omit the year or just say "yesterday"). I am writing to inform you that I agree with what you have written and I think 10:00am would be perfect. What's more, I need a conference room with an overhead projector. Could you please give me some information about the participants?
Thank you

 

The style above is rather formal, which would be appropriate if you are corresponding with someone outside the company or a customer. If you are corresponding with a colleague, a slightly less formal tone would be more appropriate. It's also better to specify what sort of information you need regarding the participants. An example of a less formal style:

 

Re: Talk next Friday

 Regarding the email you sent yesterday, I agree and 10am would be fine. I do need a conference room and overhead projector. Could you please give me some information about the participants? Thanks.

 

E-mail

To: Mrs Jay
From: XXX
Subject:  A Talk Next Friday.
With reference to your email dated May 16th 2017,  about a talk on my most recent project, I am writing to inform you that I am fine making a presentation on it. 10:00am is a good time. I would prefer making my presentation in a conference room with an overhead projector. Also could you give me some information about the participants please?

Best regards​