English Training Course - Talking about email - Part 3

Today we will talk about how to write a friendly and diplomatic email.
Task A: How can you establish a good relationship with someone if you only communicate by email?
Here are some strategies. Do you think they are useful?
-On Fridays, wish the person you are writing to a good weekend.
-On Mondays, ask how their weekend was.
-Always stress your thanks for any help or information they have given you.
-Avoid writing an email when you feel angry or upset.
-Accentuate the positive and think very carefully about how you express negative points.

Task B: An Austrilian company is working with a Chinese developer to launch a new software product. The Austrilian project manager replies to Zhang Lina about the launch schedule.
Considering how to rewrite the mail in a more diplomatic way.

To: Zhang Lina
Re: Pre-launch development conference
Dear Lina,
The dates you've set for the pre-launch development conference (11-12 Sep) are no good. I told you before that nobody from the Austrilia office is free to attend at that time. You must change it to the following week.
I received your latest software prototypes and have passed them onto all team members.
Send me the new dates asap so we can finalise our schedule.
Regards
John

Task C: Question Match

Task D: Use appropriate phrases to make the mail on Task B more friendly and diplomatic. Refer to the launch schedule. Show consideration for the fact that changing the date will affect other scheduled events too. Wish Lina success on the software development project.
To: Zhang Lina
Re: Pre-launch development conference
Dear Lina,
Many thanks for sending us the information on the launch schedule. However, there seems to be a slight misunderstanding about the dates for the pre0-launch development conference. I 'm afraid that no one from here will be free to attend on 11-12 Sep. I am really sorry if I didn't make that clear in my last email. Would it be possible to reschedule the conference for the following week? I realized that will mean changing some of your other scheduled events. I'm very sorry about that.
Could you please let me have the new dates for the conference as soon as you can because obviously we have to plan our schedules at this end.
Thanks a million for the software prototypes. We are all extremely impressed with the work you guys have done.
We wish you every success with the rest of the software development project and look forward to meeting up with you at the conference.
Best regards
John