> ## Documentation Index
> Fetch the complete documentation index at: https://docs.abrahospitality.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Update Reservation

> HMS booking modified event

# Update Reservation

An existing reservation is modified in HMS.

This event is triggered when HMS sends an `OTA_HotelResNotifRQ` message with `@ResStatus="Modify"`.

## Data Synced

* Reservation details (confirmation number, check-in/check-out dates, status)
* Room type and rate plan
* Guest information (primary guest and additional guests)
* Nightly rate breakdown
* VIP status and membership
* Reservation notes and special requests

## Effect in ABRA

When this event is received, ABRA:

* Refreshes all reservation details (same process as a new reservation)
* Updates guest profiles for everyone on the reservation
* Updates room type and rate plan assignments
* Imports any new or changed notes for processing
* Preserves the existing reservation status (modifications do not change status)