Users are told they can

simulate two types of conversations. Type 1 to have a conversation with a simulated partner. Type 2 to include a mediator bot.

and that

to learn about what else you can do, type assistance.

Once a user goes through the initial setup, the user is taken into the simulation.

You are now entering an alternative world. Your partner is just about to text you about the event next Saturday.

Once in that world, a user talks to their partner. The user and Chris go back and forth for a short amount of time, before Chris (their partner) asks to include the mediator bot. The mediator bot introduces themselves and the four stages of conversation (sharing phase, exchange phase, evolution phase, response phase) I mentioned before.