Antibiotics

A 41-year-old male presents to the doctor’s office you work at complaining of a sore throat and headache. Upon examination, he is diagnosed with a virus that is currently prevalent in the area he works. He is told to rest and drink liquids until the virus has run its course. He becomes irate and tells you he wants an antibiotic. How could you explain to him why he does not need an antibiotic? What are some alternatives you could consider for a patient who demands an antibiotic?