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 see the letter I got from Bradford Films ? They sent it in response to your phone call last week .  
 Person2:If they wanted to say something about my call last week , why didn ’ t they sand it to me ?  
 Person1:        I guess they must not have your contact information , so they sent it addressed in care of your department head . Anyhow , they wrote to confirm in writing what you discussed about the Milton contract .  
 Person2:Can I see it for a second ?  
 Person1:        Sure , here it is ...  
 Person2:Dear Mr . Clark , Further to our telephone call last Friday , I am writing to confirm our meeting on july 21 . As we discusses , our meeting is to review the contract details .  
 Person1:        Did they ask you to send the files beforehand ?  
 Person2:Let ’ s see , ” we would e grateful if you could please send related materials to our office prior to our meeting . ” It looks like ... hey , was there anything else sent along with this letter ?  
 Person1:        I don't think so , why do you ask ?  
 Person2:The letter reads , “ please find enclosed a copy of our agenda for your review . ” I don ’ t see anything else in the envelope ...  
 Person1:        Maybe they forgot to attach it to the letter . You should give them another call . 

formal