Hello, my name is Ada Wen. I am a graduate from South China Normal University. I want to apply for this post because it seems tailored to my competencies, which include sales and marketing. I used to have a three-month internship in ABC Company as a sales assistant, where I helped to make phone calls to promote our products and check the sales figures with my teammates, which had resulted in a 10% increase in sales and our boss was satisfied with our active and careful work. And I am confident to be qualified for the advertisement seller. Thank you.
Your self-introduction is complete, including your major, work experience and competence, which fit the post. Your interviewers will know you better througth it.
Your self-introduction is concise and specific. It shows your strength to the interviwer and I think you will be picked.
Your self-introdution is very specific and concise. It' s very clever to use the example and number to show to experience and skills.