There are limits to what phone agents are able to do which vary by airline. For example I was able to use miles to upgrade a family member with one airline (and I did not even need to be added to the reservation) but when I tried to do so for a friend flying another airline with which I also had miles they could not make it happen. My suggestion would be to go to the ticketing counter for BA at Denver Internaitional and see if it can be done there. As there is only one flight per day which departs around 6:45 PM I would suggest going around 3:45 as airlines with limited operations usually open up their counters aound 3 hours prior to departure time.
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