What is the main conflict in Hay Fever by Noel Coward?

Hay Fever is set in the hall of the Bliss family home. The eccentric Blisses, Judith, a recently retired stage actress, David, a self-absorbed novelist, and their two equally unconventional children, live in a world where reality slides easily into fiction. Upon entering this world, the unfortunate weekend guests, a proper diplomat, a shy flapper, an athletic boxer, and a fashionable sophisticate, are repeatedly thrown into melodramatic scenes wherein their hosts profess emotions and react to situations that do not really exist. The resulting comedic chaos ends only when the tortured visitors tip-toe out the door.