Mark wants to get as much attention as he can from other people, so he can sell more of his product (tacos).
Action
Of course!
Could I get a large taco?
Jacob is very interested about a man that is shouting, it brings his attention and makes him curious.
Onboarding
Here you go! Have a nice day!
Thank you very much! You too!
Jacob considers Mark's words, and gets hungry after he hears about delicious tacos with an affordable price.
Retention
What a nice man! I will definitely buy tacos from him again!
Jacob decides to purchase a large taco from Mark.
Mark gives the large taco to Jacob. He also tries to be as polite as possible, so Jacob will come by again in the future to get some tacos.
Jacob enjoys his XL taco and think about Mark as a good person. He also wants to buy tacos from him in the future, and shares his good experience with his friends, while giving a shout out to Mark.