I have gone through this stressful experience for my friend. I was there with him and we were waiting in the terminal and when we checked out from the airport he forgot to pick it up. Good news we found it. i will tell that story some other day. But let me tell you about the steps you can take to increase the chances of finding it. Here’s a guide on how to find your lost bag in the airport:
- Stay Calm:
This is the first thing you need to do, that to remain calm and composed. Panicking will not help the situation and may hinder your ability to think clearly.
- Report the Loss:
Immediately report the loss of your bag to the airline’s baggage service desk or the airport’s lost and found department.
Provide a detailed description of your bag, including its color, size, brand, and any distinguishing features or contents. 
- Fill Out a Lost Baggage Report:
Fill out a lost baggage report with the airline or airport staff. Be sure to include your contact information and details of your travel itinerary.
Keep a copy of the report for your records.
- Provide Identification Information:
Provide any identification tags, baggage claim receipts, or other documentation related to your lost bag.
If possible, provide a recent photo of your bag to help airport staff identify it more easily. 
- Stay in Communication:
Stay in touch with the airline’s customer service representatives or the airport’s lost and found department.
Provide them with a reliable contact number and address where you can be reached.
- Check Baggage Tracking System:
Many airlines have online baggage tracking systems that allow you to monitor the status and location of your lost bag.
Use the tracking number provided on your baggage claim receipt to check for updates on your bag’s whereabouts.
- Follow Up Regularly:
Follow up with the airline or airport staff regularly for updates on your lost bag.
Be persistent but polite in your communications, and provide any additional information requested promptly. 
- Explore Other Resources:
In addition to contacting the airline or airport, check with other relevant authorities such as transportation security agencies or local police departments.
Some airports have dedicated lost and found offices where lost items, including bags, are kept.
- Consider Compensation:
Familiarize yourself with your rights as a passenger regarding compensation for lost or delayed luggage.
Airlines may offer reimbursement for essential items purchased due to baggage delays.
- Be Patient:
Finding a lost bag can take time, so be patient and persistent in your efforts.
Maintain regular communication with the airline or airport staff until your bag is located and returned to you. 
Losing a bag at the airport can be a challenging experience, but by staying calm, reporting the loss promptly, and following the steps outlined above, you can increase the likelihood of finding your lost bag. Remember to stay in communication with airline or airport staff, use available tracking systems, and explore other resources such as lost and found offices to assist in your search. With patience and perseverance, you can hopefully reunite with your lost bag soon.