I travel to Las Vegas every year. 我每年都去拉斯维加斯旅游。

That's amazing. 那太棒了。 

It's much to be regretted that you can't join us in the trip. 这次旅行您不能同行真的很遗憾。

It's much to be regretted that you can't join us in the trip. 这次旅行您不能同行真的很遗憾。

I feel sorry too. 我也感到很遗憾。