virtual bool RequestReservation ( const [FOnlineSessionSearchResult](API\Plugins\OnlineSubsystem\FOnlineSessionSearchResult) & DesiredHost, const [FUniqueNetIdRepl](API\Runtime\Engine\GameFramework\FUniqueNetIdRepl) & RequestingPartyLeader, const [TArray](API\Runtime\Core\Containers\TArray)< [FPlayerReservation](API\Plugins\OnlineSubsystemUtils\FPlayerReservation) > & PartyMembers )