What you can do is perform first aid on the person with breathing difficulties and if the breathing difficulties persist you should request for medical help.
The following can be done in terms of first aid but this requires some training
Check the person’s airway, breathing, and pulse.
If necessary, begin cardiopulmonary resuscitation (CPR).
CPR combines rescue breathing and chest compressions.
Loosen any tight clothing.
Help the person use any prescribed medicine (an asthma inhaler or home oxygen).
Continue to monitor the person’s breathing and pulse until medical help arrives.
DO NOT assume that the person’s condition is improving if you can no longer hear abnormal breath sounds, such as wheezing.
If there are open wounds in the neck or chest, they must be closed immediately, especially if air bubbles appear in the wound. Bandage such wounds at once.