I have two one way tickets to South America and back from Melbourne as reward seats. Now i'm trying to book some internal flights on latam airlines. I want to fly from Buenos Aires to Rio and two days later from Rio to Santiago to connect to my flight home. There is a reward seat listed for the first leg on Latam and when I rang to book it the Qantas frequent flyer call centre said it could not be done because the flight did not originate in Australia. They said they did not have pricing for that flight. This doesn't sound right to me. I would appreciate anyone's experience with this and how to go about it.