How do you say

My friends and I have made an appointment to travel together next month.

..in Chinese?

我和朋友約好了下個月一起去旅行。

wǒ hé péng yǒu yuē hǎo le xià gè yuè yì qǐ qù lǚ xíng 。

How do you say "It’s been three months since I saw him, and he looks very thin." in Chinese?