Hi, I have a flight that includes SEA-LAX in Main and LAX-HND in First. I already checked in last night, but this morning I received an EF alert that there's award spaced for First on SEA-LAX. Does anyone know if I can still change cabins? I tried to change the booking online but it says to contact the call centre. I just want to check if this is doable before I give them a call.