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 wouldn't believe what I got in the mail today ! 
 Person2:what's that ? 
 Person1:        it's a letter from Ray and Sue in Shanghai ! 
 Person2:have you read it yet ? 
 Person1:        no , I thought I'd wait until you got home . 
 Person2:go on , read it out loud . 
 Person1:        ok . It says , " Dear Jessica . It was so good to receive you letter . I sounds like you and Riley are settling into your new home with ease ... " 
 Person2:when did you send her a letter ? 
 Person1:        just a few weeks ago . Sue and I send letters to each other often . 
 Person2:I didn't know anyone did that any more . Ok , go on . 
 Person1:        ok ... I'm going to have to skip over this section . It's girl-talk . 
 Person2:that's fine with me . 
 Person1:        oh . It's actually all rather personal . 
 Person2:well , skip over all of that and read me the rest . 
 Person1:        ok , it just says , ball , blah , blah ... " Ray and I look forward to seeing you in June . Write soon . With love , Sue . " 
 Person2:are we going to see them in June or are they coming to see us ? 
 Person1:        didn't I tell you ? We're going to Shanghai to stay with them in June . 
 Person2:oh , I guess I missed that . 
 Person1:        men ! 

informal