# `flights.duplicate_booking` — Duplicate booking

**HTTP status:** 409  
**Retryable:** no — change the request or the flow first

## When it happens

An identical booking already exists (same offer or same request).

## What to do

Look the existing booking up with `GET /flights/bookings?agencyReference=…` before booking again.

## Example response

```json
{
  "type": "https://quickota.com/developers/errors/flights.duplicate_booking",
  "title": "Duplicate booking",
  "status": 409,
  "code": "flights.duplicate_booking",
  "detail": "An identical booking already exists (same offer or same request).",
  "suggestion": "Look the existing booking up with \u0060GET /flights/bookings?agencyReference=\u2026\u0060 before booking again.",
  "retryable": false,
  "requestId": "req_7f3a2c9e41d0b8a6c5e21f90"
}
```

See [Errors](https://quickota.com/developers/guides/errors) for how to handle errors in general.