If you are also not able to give time to your girlfriend due to office work, then now you don't need to worry. You can follow these tips.
You can honestly tell your girlfriend that you are busy and will definitely talk to her when you are free. Both of you can find a solution to the problem together.
Whenever you take time to meet them, try to make those moments special. You can surprise them or even give them some gifts.
Apart from this, whenever you get some time in the office, you can talk to your girlfriend through call or text.
After working from morning till night, you can go out for dinner with your girlfriend or even plan a movie at night.