Sentence 1: The teacher assigned us to a partner for an assignment. 
 Sentence 3: She told me that she has a boyfriend and wasn't interested 
 Sentence 4:  I immediately had a bad impression and requested another partner 
 Sentence 5:  My friend was kind enough to switch partners 
 Option 1: I introduced myself to my partner and asked her for her name. 
 Option 2: I introduced myself to my partner and asked him for his name.