Booking status.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/enums/booking_status.proto)

| Enums ||
|---|---|
| ## `BOOKED` | The booking is active and holds inventory for the campaign. |
| ## `BOOKING_CANCELLED` | The campaign was booked, but was in a non-servable state for too long and the booking was cancelled by the system. |
| ## `CAMPAIGN_ENDED` | The campaign has ended and is no longer holding inventory. |
| ## `HELD` | The campaign is holding inventory, but the booking is not confirmed. |
| ## `HOLD_EXPIRED` | The hold on the inventory has expired. |
| ## `UNKNOWN` | Used for return value only. Represents value unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |