After interview, better forget it and give them time to do their job.
Push too hard will lose the negotiation power later on.
However, If you really like the dream job and do nothing will not make you feel comfortable for the coming Christmas, how do you think the following email?
Dear Johnney,
Thanks so much for arranged me the on-site intervew two weeks ago!
I am so excited in these days about the opportunity to make contribution to the company and think about how can I be better prepared to start the work after New Year.
I am writing this email to say Happy Holiday Season to you and also wondering what is the decision of the hiring for this position?
Wish I can get the result soon!
Wish you have a Very Merry Christmas and a Happy New Year!
Thanks!美国老土 只有自己觉的自己的事最重要, HR可不这么想