Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input:  Person1:       Jim , I heard you took a trip to San Diego . Is that right ? 
 Person2:Yeah , I just got back this morning . 
 Person1:        That sounds really nice . What did you do there ? 
 Person2:Well , we were only there for three days , so we didn't do too much . We went shopping and went out to dinner a few times . And at night we walked around the city with some friends . 
 Person1:        Did you take any pictures ? 
 Person2:Yes , I have them with me . Do you want to look at them ? 
 Person1:        Sure , I love looking at photos . 
 Person2:This one is of my wife and me on the beach , and this one is our daughter Emily standing next to my wife . 
 Person1:        Your daughter looks like her mother . 
 Person2:I know , they look very similar . 
 Person1:        Where was this picture taken ? 
 Person2:That was taken at the train station before we left . 
 Person1:        Did you have time to go to the zoo ? 
 Person2:No , not this time . We went there last time . 
 Person1:        It looks like you all had a nice time . 
 Person2:Yeah , it was a lot of fun . 

informal