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 week 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 Dan. But it's a pity you can't come.