It's a godsend to meet you here.
在这遇见你真是喜出外.
What a coincidence to meet you here.
真巧在这儿碰到你.
Yes.What a coincidence to meet you in Shanghai.
是的.真巧在上海遇到你.
What a pleasant surprise!
真没想到会遇见你!
This is a pleasant surprise!
真没想到会遇见你!
Harry,you old bastard!Fancy meeting you here!
真没想到在这里遇见你!
Hello there,what a coincidence!
真巧啊!
What a(pleasant) surprise(meeting you here)!
真没想到会（在这里）遇见你.
I didn't expect to meet you here!
真没想到会（在这里）遇见你.
I am very glad to meet you.
我很高兴遇见你.