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:       Hello , towing service . What ’ s your problem ?  
 Person2:Yes . I need a tow truck . My car is broken down .  
 Person1:        Where are you now ?  
 Person2:I ’ m on the Highway 401 , close to the Lipton Link .  
 Person1:        All right . I got it . What color is your car ?  
 Person2:Black .  
 Person1:        And plate number .  
 Person2:AKIM 400 .  
 Person1:        Okay . Just stay in your car . We ’ ll be there in five minutes .  
 Person2:Thanks a lot . 

informal