A 29 year old millionaire Irving Carter visits a store named "Biggest Store" and immediately falls in love with one of the 3,000 sales girls there - an 18 year old beautiful blonde Masie.
The next day, she tells one of her friends at the store that she has ended her relationship with Irving because he wanted to take her to Coney island after wedding.
A simple and very basic interpretation is that when Irving was surmising about taking her after wedding to the temples of India, the Japanese gardens and the camel trains and chariot races in Persia, she simply thought he wanted to take her to Coney island.
Another - a more sublime - interpretation is that Masie never found any hint of love in Irving's talks.
She found only a "show-off" and so she spurned him, knowing fully well that she was rejecting a real rich person as a possible husband.