Enjoy your meal ! 

Have a nice trip!

Enjoy yourself! 

Good luck! 

Well done!    /     Congratulations! 

What a pity!   /    Too bad! 

There isn't any left. 

It doesn't matter.  /   Never mind

Don't worry!

Look out !   /   Be careful ! 

Welcome!

Nice/Pleased  to meet you

Leave me alone. 

I miss you