Sentence 1: Pamela went to a conference in Chicago. 
 Sentence 3: She also didn't know where to eat her lunch 
 Sentence 4:  So she went to the cafeteria and looked around 
 Sentence 5:  A group of strangers waved to her and she was relieved 
 Option 1: She was used to see so many new people, and was calm. 
 Option 2: As she wasn't used to see so many new people, she was overwhelmed.