我们周五晚上开了个晚会 » Our week has opened 5 evening gala 跟你聊天很开心 » Talk to your chat happily 这样既可以放松自己也可以更好地学习 » This can relax also allows for better learning ..
Say, "It was nicetalking to you, I'mgoing to get back to my friends… (or shopping, or whatever)" and as you turn away, turn back and say "Do you have email…?" etc.