# Pax

You can automatically select the number of people for a reservation.

At this time, this feature is available for adult options only using the `msm_int_adult` parameter. We strongly recommend using this parameter with a [destination parameter](/white-label/deep-link/destination).

The example below directs users to London's destination page with a request for three adults:


```
{baseUrl}?msm_int_destination_name=London&msm_int_adult=3
```

Users who choose an activity will find the quantity pre-selected in the *Availability and prices* section:

![Example of pre-selected adult option](/assets/adult-selected.130f2e609c06fc22abc97ba3f9461f717c92dab4b11fc9bc84a6f96ae92860c7.f0e1a66d.jpg)

If no valid options are available, nothing will be selected.