One day Frank and Alice decided to go for a flight in a balloon because it was Alice’s birthday.  They bought their tickets and set off for the flight place.  On the way they met a man who offered them some tickets for a rock concert. They had no idea what to do because both of them were Wednesday morning so they decided to say to the man “Sorry, but we are going on a balloon flight at the exact same time as the rock concert.”  The man then said “Okay, have a nice time.” So they went and enjoyed themselves.