What did you learn from the ppt and lack of preparation.
There are tons of things and different ways you can move ahead in life. Being in the Pre Sales is the best job you will ever have.
Make sure to do the best of your chance, you won't get it again and again, prove your worth.
Be Strong technically, create projects, Demos, Events, ppts.
Make sure when the customer or other people interact with you let them walkout with learning and feeling like yeah, I spent really good time with Neil.