很抱歉，我有事要先走了，下次在聊，再见！ 英文

I'm sorry, I have to go now. Talk to you some other time.

I have to go 已经足够，不必再说to do something。 下次，即是说还没约定，也不知是什么时候，因此用some other time比较合适。
如果已是惯性的聊天，比如每天晚上，那就可用next time.

抱歉的说一句，楼上的“一定正确”一点也不正确！！！

I'm so sorry, I have to go now, talk to you later, bye!

Sorry, i got to go, catch up with you next time, ciao!

Feel sorry that I have something to need to have gone first , being chatting next time , very much, good-bye!
一定正确！！

Was sorry very much that, I had the matter to have first to walk, nexttime will be chatting, goodbye!
准确翻译