Don't worry. It's no big deal.No problem. It's no biggie.
no biggie
don't worry about it US, 1982
no biggie
(Something) not inconvenient or difficult at all; not at all troublesome. John: "Thanks so much for watching the kids for me last night. There was an emergency in work." Dave: "No biggie, man. I'm happy to help out."It's no biggie if you want me to drive you to the airport tomorrow.