In general, one aspect disclosed features a system, comprising: a hardware processor; and a non-transitory machine-readable storage medium encoded with instructions executable by the hardware processor to perform operations comprising: identifying a seat in which a passenger is seated in a conveyance having multiple seats based on wireless signals exchanged with a device of a passenger; determining a payment status of the ticket of the passenger using the wireless signals; and generating a map of the conveyance indicating the seat in which the passenger is seated and the payment status of the ticket of the passenger.