Can you make the meeting on Friday?
你能参加周五的会议吗？
Will you be able to meet on Monday?
星期一你能去开会吗？
Would Friday at 3:00 be possible?
星期五三点有可能开会吗？
Are you OK for Tuesday?
星期二的会议你能来吗？

I am sorry I can't attend the meeting.
很抱歉，我不能参加这次会议。
I don't believe it is possible for me.
我想我可能不能来参加这次会议。
Sorry. I can t make the meeting on Friday at 3:00.
抱歉，我不能参加星期五三点的会议。
It looks like Friday is going to be difficult.
看起来星期五开会有些困难。