it depends, if you wanna authorize a person to go to an organization, you may use the word 'represent' or u just tell the organization that person is authorized person or representative. if you want to tell someone to go somewhere and you do not like the word 'go', you may say, you may seek help from the minstry of agriculture, or the minstry of agriculture would be my recommendation. In my opinion, if you want to use a formal way to explain sth, the passive voice would be better.
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Hi,
Look at meaning 2b. http://www.merriam-webster.com/dictionary/approach
eg I'm going to approach my boss about a pay raise.
eg My manager has authorized me to approach IBM. I think I can persuade them to buy our new software package.
Do a Google search for eg 'approached