How can i hide or block the field "Raise this request on behalf of*" in the HelpDesk page

[Raphael Girardelli]

I want to block or hide the field ""Raise this request on behalf of*" when a client is openning a new ticket, because the client can choose to open the ticket in the name of other client which is causing problems to my company.

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[Kian Stack Mumo Systems]

@Raphael Girardelli, 

This field is only available to JSM agents. Your standard customers won't be able to see this. They can only raise tickets for themselves.