1. Can I talk to you right now?

我现在可以跟你谈一谈吗？

2. You got a minute?

你有空吗？

3. Can I have a word with you?

我可以跟你谈一下吗？

4. I need to talk to you.

我需要跟你谈一谈。

5. May I have a little talk with you?

我可以跟你谈一下吗？