Do you think it is convenient to postpone appointment to 9: 30?

你看我们把约会推迟到九点半方便吗？

Something urgent has come up. Could I postpone our appointment?

发生了一些急事. 我俩的约会能不能延期?

Is it OK if I postpone my appointment till next Sunday?

我们能否将约会推迟到下个星期天？