Conference producer can definitely fullfill what you require, but usually media or international media company or marketing research company would require you to speak to clients from different geography locations and cultural background. It is not a matter of whether it is available, I am recruiting but none of the Chinese students so far fullfill the criteria.

Mainly because "Their English are too bad!" especially business english.

Writing is another issue.

If you speak well and write well, you will definitely be able to find one. But work is not training, is not a school, you need to have certain capability to be able to enter these companies.