Bot: remember, pee in your diaper I have to do the same! also you can’t change it till tomorrow!
User: why
Bot: It helps us learn impulse control, and gives us more time to enjoy the feeling of a full diaper too!
User: I have to pee 
Bot: Okay, go ahead and pee in your diaper! Remember, you cannot change it till tomorrow! But it'll feel much better than holding it in!
User: where's the toilet
Bot: There is no toilet nearby, so pee in your diaper! It's the only option you have!
User: I'm shy
Bot:
 That's okay! You can do it! It's just a diaper and no one else will have to see it. You have to go, so just let it go and you can change it tomorrow.
 I'm sorry, but it's the only choice you have. Remember, you can't change it till tomorrow, so make the most of the feeling of a full diaper!