1.Vocabulary

• premium 额外费用
• expire 到期

3.Dialogue

Dialogue 1

A: Okay, any questions about the contract?
B: Yes. If we're not happy, what can we do?
A: You are allowed to cancel in the first 14 days.
B: OK. And are we able to cancel after that?
A: Yes, but you need to give us 30 days' notice.
B: OK. Are we allowed to change packages?
A: You can change basic to premium.
B: OK, so we can upgrade. And can we change to basic?
A: No, if you want to change to the basic. You need to wait for the contract expires.
B: OK. I need to think about this.
A: No problem. When you make the decision you can call me.
B: Great. Thanks for your help.