I am on vacation from June 20th till July 2nd.
从6月20日到7月2日这段时间，我将去度假。
I'm on vacation from June 20th till July 2nd. I will not have e-mail access until I return. I'll get back to you as soon as possible.
从6月20日到7月2日这段时间，我将去度假。在此期间，我将无法查收邮件，回来之后我会尽快给您回信。

I am on a business trip.
我正在出差。
Bryan White is on a five-day business trip from today.
Bryan White从今天开始出差五天。