Hey there, Krsna, and welcome to planDisney!
Thanks so much for your question - I'm sorry to hear your original travel companions can't make it, but hopefully we can get this sorted out so your trip to the Happiest Place on Earth is set up so you and your party can make new magical memories!
The good news is that names on standard
park tickets are really more of a label than a hard restriction. The first time each ticket is scanned at the park entrance, a Cast Member will take a photo of the person using it, and that's what gets associated with the ticket going forward. So if different people are using those tickets, it will work itself out at the entry gates on day one. You don't need to stress too much about the names attached to the tickets themselves. However, if these are promotional or special event tickets then it might be a different story as some of those have different requirements so I'd make sure you read the Important Details section if you have one of these kinds of tickets.
That said, if you'd still like to get the names on the tickets changed - even just to help keeping them organized - then I'd recommend
calling a Cast Member at the Tickets line to help. They'll be able to see all the details of your tickets and should be able to edit the names for you so they show up correctly in your Disneyland mobile app.
It looks like you'll be visiting the
Halloween season, which is one of my favorite times of year to visit. If you haven't yet, make sure to check out the recent
Foodie Guide on the Disney Parks Blog to see all the fun seasonal food coming during this spooky season.
Thanks again for your question, Krsna. I hope you have fun on your upcoming trip!
Have a Magical Day,
Greg