Where can I take an air ticket?

我可以在哪里买到机票呢？

Could you refund my air ticket?

请你帮我退机票好吗？

How can I get an air ticket?

我如何能买到机票？

I've booked an air ticket to Venice.

我订了一张去威尼斯的机票。

I've come here to pick my air ticket.

我来这儿取我的机票。