On our book, there is still a small balance of $648 ipen against you. There is no doubt that is must have been overlooked by you, and we expect a cheque from you soon in settlement of this account.

在我们的账面上，贵方仍然欠我们一笔小的金额$648，毫无疑问这已被贵方疏忽，我们盼望收到贵方的支票以结清此账。

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In practice, they accept special offers to members of a loyalty club, or to people who book tickets early or keep a big balance on an account.

ECONOMIST: Managing customers