1、I'm flattered.

您过奖了。

2、Oh no, not really!

哦！不敢当！不敢当！

3、Thank you, thats very kind of you to say so!

谢谢您！谢谢您能这么说。

4、Oh, thanks very much! You look very nice too.

太谢谢了。你看上去也不错。