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're late .  
 Person2:I know I'm late . I'm sorry . I tried to call you to tell you , but your phone seems to be disconnected .  
 Person1:        My phone ?  
 Person2:Yes . An automatic message says your phone is not in service .  
 Person1:        Really ? I had no idea . Let me check.Yes , it's dead . There's no dial tone .  
 Person2:So I couldn't get through . I knew I'd be late because my car wouldn't start.It was too cold I had to warm it up in the garage with a heater . That's why I'm late .  
 Person1:        But this is terrible . I'm expecting important calls .  
 Person2:About what ?  
 Person1:        You know what.The theater guild is supposed to call me and discuss a contract for my play.They are supposed to call me this evening.If I don't have a phone . Oh , what can I do ?  
 Person2:Well , the only thing you can do is tell the phone company and hope they fix it fast .  
 Person1:        Do you have a cell phone ?  
 Person2:No . I hate cell phones.But you could go to a neighbor's house and use their phone .  
 Person1:        Can you drive me ? I will go to Ann's house . It isn't far . I can call the theater guild from there and give them her number.She will let us wait in her living room .  
 Person2:Yes , of course I can drive you.So you don't want to get your phone fixed right away ?  
 Person1:        Yes , I do.At Ann's house I will call the phone company and have them check my line.If they can fix it right away without coming to my house , then we'll just return here.But if not , I need to wait at Ann's house to talk with the theater guild.It ' s very important to me .  
 Person2:Alright , let's go .  
 Person1:        Yes , let's go . 

informal