How do you say

We have our trip all planned for next month.

..in Chinese?

我们已经计划好下个月一起去旅行。

wǒ men yǐ jīng jì huà hǎo xià gè yuè yì qǐ qù lǚ xíng 。

How do you say "I’ve reserved a flight online, and I’m flying to Beijing at the beginning of next month." in Chinese?