The request needs to contain only the identifier of the country (tag country, attribute code)
You can also set a timestamp as for the country search
The (type) attribute has to be set to cities.
<?xml version="1.0" encoding="UTF-8"?>
<envelope>
<header>
<actor>test</actor>
<user>test</user>
<password>test</password>
<version>1.6.3</version>
<timestamp>20190423170100</timestamp>
</header>
<query type="cities" product="hotel">
<country code="I"/>
<timestamp>20190423170100</timestamp>
</query>
</envelope>
The response message contains in its response, tag the list of all the details of the city in the form