根据下面的提示，以“talking about having sports”为题编写一段对话(字数：80--)。
提示：
susan每天下午参加体育活动。她喜欢游泳，每星期游泳一次。david在中学时代也常游泳，但现在没有时
间，人也开始发胖了。susan邀请david当天下午一起去游泳，并约定下午三点在游泳池见面。
talking about having sports
david： susan, you like sports, don’t you?
susan： yes. i have sports every afternoon.
david： do you often go swimming?
susan： yes, i go swimming once a week.
david： i used to swim at middle school, but i don’t have time any more.
susan： that’s too bad! exercise is very important.
david： i know. i am getting fat, you see. anyway, i don’t want to be heavy.
susan： well, i’m going to swim this afternoon. do you want to go with me?
david： ok! i really need more exercises. when and where shall we meet?
susan： how about three o’clock, at the swimming-pool?