Sirena-Travel GDS provides tickets exchanging with a change of a number of flight segments.
In this case the ticket cost should be more or equal to the cost of the ticket to exchange.
The lowering of the air transportation price in exchanging is not permitted.
Changes of terms of transportation, reducing the transportation cost, can be executed through refund and new purchase.
The functional is installed for all sessions.
There are restrictions for its using, for more detail - see instructions.
The updated document (in Russian) is available on the website in the section « Instructions for agencies", «Instructions for the cashier»: paragraph 2. Instruction for cashier, Part 2. "Issuing of transportation documents, refund, tickets exchange" (07/27/2016)