In every airline, there are flight Attendants that are employed to make the flight comfortable for passengers. They serve passengers and assist them through any concerns they may have throughout the flight.
They are usually well trained to do several things including administering first aid in case of a medical emergency. They are also taught how to evacuate the cabin in case of a flight emergency.
They serve food and drinks and also guide passengers through safety requirements and how they can remain safe throughout the flight.
Furthermore, airlines ensure that there is an even spread of languages abilities among the flight Attendants to ensure that each passenger can be attended to no matter the language they may speak. For each route, airlines ensure that the dominant languages that may be spoken along that route is taken care of.