回复：哪到一个OFFER,又INTERVIEW了另一家公司,也对我赶兴趣..

Dear my dream company,
The reason I am calling you is to let you know that I have a offer on the way from another company. If you think I am tyour dream candidate, would you please try to make the decision process quicker? Because you are my dream company, I really want to have you as my first choice.

-- After get offer from the Dream Company, then:
Dear the company I appreciate,
Thanks for extended me the offer, I get another offer which I can't reject, I am writing this email to let you know that I am not going to work in your company at this moment. Hope the chance will coming in the future....

-- There is nothing to worry about.