 What is the goal of the story that Simon tells Mr. Oyster?
He looked over at Betty and said, almost as though reciting, "What I need is a vacation." "Providence," Simon told her whilst fiddling with the aspirin bottle, "will provide." Simon said unenthusiastically, "Good morning, Mr. Oyster." The client fussed himself with Betty's assistance into the seat, bug-eyed Simon, said finally, "You know my name, that's pretty good. When Simon continued to say nothing she ventured, "Time travel is impossible." "Then you'll realize that there are a dozen explanations of the paradoxes of time travel. It's my contention that within a century or so man will have solved the problems of immortality and eternal youth, and it's also my suspicion that he will eventually be able to travel in time. Simon seemed incapable of carrying the ball this morning, so Betty said, "But ... Mr. Oyster, if the future has developed time travel why don't we ever meet such travelers?" "The usual explanation, Betty, is that they can't afford to allow the space-time continuum track to be altered. Mr. Oyster went on. Mr. Oyster returned his glasses to their perch, bug-eyed Simon, but then nodded. Simon said, "You want to hire me to find a time traveler and in some manner or other—any manner will do—exhort from him the secret of eternal life and youth, which you figure the future will have discovered. Now she said, plaintively, "But where are you going to find one of these characters—especially if they're interested in keeping hid?" If you could go back a few thousand years, the things you would wish to see would be a Roman Triumph, perhaps the Rites of Dionysus, or one of Alexander's orgies. "No ma'am, you'd have to stick to some great event, both for the sake of actual interest and for protection against being unmasked." Mr. Oyster was taken aback himself. "A hundred dollars a day plus expenses," Mr. Oyster said quietly. It goes like this:" I got a thousand dollars from Mr. Oyster (Simon began) in the way of an advance, and leaving him with Betty who was making out a receipt, I hustled back to the apartment and packed a bag. It takes roughly seven and a half hours from Gander to Shannon and I spent that time dreaming up material I could put into my reports to Mr. Oyster.
 He wanted to explain why the trip would not be successful if he went to Germany.
 Simon wanted to show that he had spent a lot of time thinking about encounters with time travelers.  He wanted to explain why the trip would not be successful if he went to Germany.  He wanted to mock his prospective client for his ideas about time travel.  He wanted to prove that Oktoberfest was the wrong place to look for time travelers.