What do you hope to learn from this job at Waitrose?

"I am looking to lay the foundation for the rest of my career with this position. I looked at many job postings and interviewed some carefully selected places, but you are my front-runner. I want to learn the fundamentals of sales and become comfortable with both sides of the business. I appreciate that you want me to start with the basics of the inside sales before moving into outside sales."

"I hope to gain stronger skills in communication and customer service. I understand that retail can be challenging because of the multiple personalities you are faced with daily. I believe this will help my confidence grow and my sales skills as well."

You want to avoid saying you have nothing to learn from Waitrose. If you sound cocky or arrogant, the hiring manager may feel you would be challenging to work with.