This is an extension of another more general question on job applications that I just posted. My question here isn't about applications so much as interview etiquette. I'm an engineer and trying to change fields to get into sales or business admin. I recently interviewed for an internal sales position with the company I work for. I spent an afternoon shadowing the internal sales team, and most of what they do (here at least) involves logistics, account management and customer service. I was told by the woman I was shadowing that this is a pretty good example of what the job entails on a daily basis, so I'm not just conjecturing. A week after the interview, I was notified that I wasn't selected to continue with the process because I didn't have enough relevant experience.
Now this question is not about job skills or experience. I understand that they probably had many other applicants with far more experience than I do, and it makes sense that I wasn't the strongest candidate. However, I also know from personal experience that based on what I was shown and told about the job, I could probably learn 70% of the job in about a week. (I'm sorry if that sounds arrogant, but I'm very quick at picking up new skills and I don't believe it would take me long at all to come up to speed with the required tasks and software.)
I knows it's petty and childish, but when I was told that I wasn't qualified for this position, my internal reaction was "I can do controls analysis and work with programs like Xilinx and Sonnet. I'm pretty sure I can type numbers into Microsoft Excel and reply to emails." I know this is an unfair simplification of our sales reps' jobs and I don't mean to imply that their work isn't challenging, but I really don't think that what they do is beyond my abilities, even though I have no prior experience as an account manager or sales rep.
So I'll be better prepared if something like this ever comes up in a future interview, how do you communicate that you have the ability to learn the job (despite lack of experience) without appearing overreaching and asinine?