Stranded

I was traveling by myself from WV to Cal. I had a layover in DC. They picked me up in a wheelchair and took me to my gate. They left me there with no way to get to the bathroom. The gate had no one there to ask for help. I asked when I got to my gate if I could keep the wheelchair to use as a walker and they said no. They had to keep it with them. Finally another person came to the gate in a wheelchair so I paid the driver to take me to the bathroom and get me a drink. I had been sitting there for 2 hours at that time. There should be some way to leave the wheelchair with the handicap person so they aren’t stranded!