没面试烦有更烦,待业中年喜事连．革命形势有好转，村里事实胜雄辩

Glad you got the offer and having interviews.
Yes, try to postpone the start date of the offer.
And try to accelerate the second interview: This is the company I really want to join, I have been waiting this position for a longtime. Tell you the truth, The other company is willing to extend me an offer (or: I have a offer in hand already), It that possible you make the decision faster?

Thanks!