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:       You are late .  
 Person2:I'm sorry , it was too cold , and my car couldn't start . I had one to the garage with the heater . I tried to call you , but you couldn't get connection .  
 Person1:        Couldn't get connection ?  
 Person2:Yes , your number is out of service .  
 Person1:        Really ? I didn't know . Let me check . You're right .  
 Person2:So I couldn't get through .  
 Person1:        It's a serious problem . I make expecting an important call . The theater is guilty . It supposed to call me this evening , and discuss my play . What were happened if they can't reach me ?  
 Person2:Well , the only thing you can do is pay the fee to recover your service . 

informal