Hello, our company process customers' personal data for the Client. We are providing consulting services for the customers, including consulting on air transportation issues. If a particular customer asks to transfer his/her personal data to a third party service provider which deals with these issues to assess the possibility of entering into a contract with such customer, this third party service provider would be a controller under GDPR before it enters into a contract with a customer? Or he would be in some different role? Thanks.