Ok... so when I purchased the original itin that Im currently in the middle of flying, I could get assigned seats on all flights except for one. When I asked an AA telephone agent, it was explained to me that this was because AA would be changing the aircraft, so all seats were blocked. I didnt give it more thought as the agent told me that on the day I checked in for the first flight I would get an assigned seat. So today is that day.... Im flying MFE-DFW then DFW to Kansas City... and then Kansas City to ORD. Its this last flight that I still dont have an assigned seat for. The MFE agent tells me that its not because of a plane change, rather that this flight is oversold and that they will try to buy people off this flight. I explain to the MFE agent that I cant afford not to land in ORD this evening.... and ask if under this oversold situation I cant get a no-fee rerouting. She answers that she cant do it as its not the MFE stations responsibility... and that I should wait until I get to Kansas City and speak to an agent there.... I quote "this is a Kansas City problem, they need to ensure they get you to ORD". Now.... I dont want to roll the dice... so then, do I have a point about wanting someone at DFW to change my routing and not charge me fees....? Please advise....... Thanks.