There isn't a specific university degree required to become a flight attendant (air host/hostess). Airlines prefer candidates with strong interpersonal skills, a professional demeanor, and the ability to handle stressful situations. While a degree can be helpful and might give you an edge, it's not mandatory. Many flight attendants have degrees in various fields, but some have no degree at all.
Airlines themselves provide the necessary training for the job. The focus of this training is on safety procedures, customer service, and airline-specific protocols.