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:       Have any plans for the weekend , Tom ?  
 Person2:Yeah , I ’ m going for a hike in the southern Rocky Mountains .  
 Person1:        Oh , do you go hiking often ?  
 Person2:I go as much as I can . I love hiking because you can really get in touch with nature .  
 Person1:        It would be nice to get out of the city . Do you want some company ?  
 Person2:Sure . But , it will be a long hike , 30 miles in three days . Have you been hiking before ?  
 Person1:        Yeah , I go a lot too . I saw a bear and a mountain lion on my last hike .  
 Person2:Wow ! You must have been pretty far away from the city .  
 Person1:        Yeah , my friend and I hiked in a very wild part of the national forest .  
 Person2:Well , bring him along too . We ’ ll have a great time this weekend .  
 Person1:        Thanks , I ’ ll ask him . 

formal