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 ? Is that Mark ?  
 Person2:How are you ? I haven't heard from you in ages .  
 Person1:        I've been overseas , So have you been busy lately ?  
 Person2:Pretty busy.So are you back for good ?  
 Person1:        Yes , I was just wondering when you'd have time to go fishing .  
 Person2:Well , I'm not working on the weekend , so we could grab some beer , ice and our fishing rods , and head out to the river .  
 Person1:        That sounds good . I've missed you my friend .  
 Person2:Same here . 

informal