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:       Did you hear how cold it got last night ?  
 Person2:I heard the radio announcer say it was 18 degrees below zero .  
 Person1:        It was so cold this morning . I could hardly start my car .  
 Person2:My car didn't want to start either at first .  
 Person1:        Don't you have a garage ?  
 Person2:Not in the new apartment . We have to leave the car in the parking lot .  
 Person1:        How much antifreeze did you put in your new car then ? You must have to keep it well below zero .  
 Person2:I do . Right now I have it protected up to 30 below zero .  
 Person1:        Does it ever get that cold on here ?  
 Person2:Not really . It sometimes gets to 20 below .  
 Person1:        Speaking of cold , how about going for a cup of coffee to warm up . 

informal