Hey, Peter. I'm sorry.
Hi, Diana. What's wrong?
We were going to Hong Kong this weekend. But I'm afraid I can't go.
How come?
I have a really big geography test and I have to study for it.
We can go next weekend instead?
No, I don't want to ruin your weekend. You go ahead and please take the book I bought to my friend Sally. Tell her I have to study all weekend, because I can't afford to fail the test.
OK, then I'll go with them. But it's a pity you can't come.