Tell them about your passion for working at Jamba Juice, how you have prepared for this job, you understand what type of employee Jamba Juice is looking for, and you hundred percent believe you are the best candidate for them.
You are passionate about healthy eating options, and you want to provide delicious smoothies to their customers. Meanwhile, you will work hard, and give your best effort no matter what. You are not the type of person who calls off sick, will show up late for work, you will be fully committed to this job if hired.
Describe yourself in that kind of confidence and manner, and you should easily get the job at Jamba Juice!