You will be given a definition of a task first, then some input of the task.
In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: The Best Two Years portrays the experience of four missionaries of The Church of Jesus Christ of Latter-day Saints living in the same apartment in Haarlem in the Netherlands.  The movie begins with Elder Rogers finding out that his new companion will be a "greenie", a newly trained missionary fresh from the Missionary Training Center.  He and the other two missionaries that reside in the same apartment, Elder Johnson and Elder Van Pelt, go to the train station to meet the new elder.  Elder Rogers finds out that the new missionary, Elder Calhoun, is exactly what he had jokingly predicted his new companion would be like.
Elder Rogers used to be an excellent missionary, until his girlfriend married one of his former mission companions.  That is why he and the other two missionaries residing in the same apartment are surprised that the mission president has assigned him to be the trainer (first companion and mentor) to a missionary new to the mission.
The new missionary, Elder Calhoun, tackles mission work with unbounded enthusiasm.  He attempts to talk to anyone although he has little knowledge of the Dutch language.  Despite his poor Dutch, he continues to have an eager attitude.
Fortunately for him, he soon encounters a man from the United States that speaks English.  They speak briefly in the park before the man goes off with his girlfriend.  Later, when he encounters the same man in a market, Calhoun gives him a Dutch Book of Mormon with his telephone number.  Despite what the other three missionaries expect, the man does call and asks for Calhoun.
Output:
What is the name of the person who speaks to the man from the United States briefly in the park?