We had this situation on our trip to Italy last May. My daughter's name starts with a K but the ticket had a C for the first letter. We made it all the way to boarding and somehow the ticket agent noticed it. They pulled us aside and and told us we might not be able to board. They made calls for about 10 minutes and held the plane briefly. The ticket agent wasn't very cordial or happy. She said she didn't want to put us on the plane and would need to get it worked out and then get on another flight. Our first flight was a stopover in NYC. The gate agent finally said I don't want to do this, but I'm letting ya'll get on and clear this up in NYC since the airline didn't have any other flights to NYC that morning or early afternoon. We were lucky. I would for sure try to get it worked out before. When we got to NYC we went to the airline for our next flight and it took a few minutes to get the name corrected and then we were on to our next flight. It was pretty stressful. Try to get it worked out with your booking airline asap. If you used a third party booking agent, get with them asap.