Sentence 1: I went to the Lost and Found department to see if they had my bag. 
 Sentence 3: I told them what it looked like, but they didn't have it there 
 Sentence 4:  Then I found my bag at my friend's house 
 Sentence 5:  I must have left it there last week and forgotten 
 Given Sentence 2: They asked me for a description of my bag.