The Bus Is Here!

There is a bus of elderly people who arrive about once a month or maybe once every two weeks. Every time they come in, they put a strain on our crew. They are short-tempered, confused, hard to please, and hard of hearing. They often come in with cosmetics products that weren't made in decades or ones we don't carry. There is usually one or two attendants for about six of the elders. I try to be nice and courteous to them, but it can be very difficult.
One of the elders came up to my register with a Covergirl foundation and a blush. The deal we have this week is buy one get one at 50% off. She didn't realize the foundation was about twice as much as the blush and wanted to know why it was so expensive. Then she said she didn't want the foundation. So I rung her up for just the blush. She went to go sit at a then unused register and discovered the foundation wasn't in her bag. She starts yelling to me, asking where it was. I am in the middle of ringing up a loud Russian woman, who was only sort-of polite, so I told the elder to wait until I finished so I could help her. She told me she did want the foundation, so I rung it up for her, and I realized my line has quadrupled. I handed it back, she told me to open it for her. A few minutes later she is yelling to me again saying I didn't give her her change. Which of course I did, because she found it in her coat pocket a few minutes later.
Another elder in a wheelchair yelled to me from the front door, asking who was here. I asked her who she needed to speak to, and she told me to start naming names and she would choose somebody. I started listing a few of us off, but then had to tell her her first choice had temporarily left the country. She asked for another woman on staff. When I called my co-worker to the front:
"What, Kim? What?!"
"That woman needs help."
"In cosmetics?"
"Probably. She asked for a woman."
"I'm not in cosmetics!"
"What do you want me to do? She asked for a woman, I can't help her from behind this register, and the rest of the staff are men. What do you want me to do?"
She and I didn't speak for the rest of the day.