```
Bruker -> Online Bus Reservation System:Søk etter busser
Online Bus Reservation System -> Bruker:Vis liste over tilgjengelige busser
Bruker -> Online Bus Reservation System:Velg en buss
Online Bus Reservation System -> Bruker:Vis setetilgjengelighet
Bruker -> Online Bus Reservation System:Velg et sete
Online Bus Reservation System -> Bruker:Vis prisdetaljer
Bruker -> Online Bus Reservation System:Oppgi betalingsdetaljer
Online Bus Reservation System -> Payment Gateway:Bekreft betaling
Payment Gateway -> Online Bus Reservation System:Bekreft betaling
Online Bus Reservation System -> Bruker:Generer billett
```