Onboard crew was great, but I was unable to check in on my phone so after my connecting flight I checked in right at the gate, at that time they assigned me a seat but didn’t tell me that I wasn’t allowed a carry on bag and needed to check it due to my boarding group. While boarding was when I was informed I needed to check my bag at which time they informed me I needed to pay $65 since I didn’t check it at check in, I informed them that I had a connection and didn’t check in regularly at LAX and was unaware I needed to check my bag, at that time they changed the charge to $35 but I was still disappointed I needed to pay anything considering it was a small carry on bag that I wasn’t told I needed to check before hand.