Task: Question Answering
Input (English): Passage: When Ella Finch and her sister Kate inherit $30,000 each just after the end of World War I, Ella becomes dissatisfied with her dull life in South Bend, Indiana, and with Kate's butcher boyfriend Willis. She is convinced she can rectify both problems by taking Kate to New York City. Her wisecracking cigar salesman husband Ernie is unable to change her mind, so he reluctantly goes along, postponing a promotion at work by claiming to his boss, A. J. Gluskoter, that his wife is sick and needs a stay at a sanitarium. On the train, they meet New Yorker Francis Griffin. Ernie is less impressed with him than his wife and sister-in-law.
In New York, Ella helps Katie try to win over Francis, but it turns out that he is actually infatuated with Ella. She has to punch him to fend off his unexpected advances. Ernie shows up later and knocks him down too.
Ella then rents an apartment. Ella meets their wealthy neighbor, Lucius Trumball, who invites them all over for drinks. Ella is delighted, but Kate is not pleased when she discovers that Trumball is much older than her. Later she finds out he is also married when his wife returns unexpectedly from Timbuktu.
They return to the hotel they stayed at before, where they meet Herbert Daley, who owns race horses. At the track, Daley persuades them to bet on his horse. It wins, but then Daley's jockey, Sid Mercer, shows interest in Kate, much to Daley's annoyance. Kate secretly sees Sid while also going to the track with Daley with Ella and Ernie. Daley returns early from a trip and catches Sid kissing Kate, but Kate assures him there is nothing serious going on, and they become engaged. 
Question: What is the last name of the person that Ella tries to help Katie win over?
Output (English): Griffin.