I tried multiple times to request an Uber who was ...

I tried multiple times to request an Uber who was a trusted personal friend. I had sedation for a medical procedure and couldn't just ride with anybody. Your mobile app SUCKS and I was extremely inconvenienced. I had to keep cancelling rides be my trusted friend's car wasn't showing up which I was IN already! Why isn't there a phone number to call someone to work this out?? So frustrating and upsetting! I'm moving over to Lyft who doesn't have these issues.