博客探讨了客户和旅行社代理人的区别，在用例图中未体现二者差异。实际上，二者使用不同UI完成机票订单，作业中提到客户使用网页，旅行社代理人使用应用程序。
What's the difference between customer and travel agent? I didn't tell any diffence between the two actors in the Use Case Diagram.
It seems that the customer and travel agent use differenct UI to fulfile the flight order. In the assignment, it says that "customer using the web and the travel agent using an application"
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