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:       I haven't seen your father in like 5 years . How is he doing ?  
 Person2:He's not doing too well .  
 Person1:        Why ? What's wrong ?  
 Person2:About a year ago , he started feeling weak all the time .  
 Person1:        Is it due to old age or is he sick .  
 Person2:Maybe a little of both . The doctor's can't point out anything specifically . I think it is because he didn't take care of himself during his youth .  
 Person1:        That makes sense . It's important to take care of your health early in life .  
 Person2:That's what my father tells me almost everyday .  
 Person1:        Well , I hope he starts feeling better . Say hi to him for me .  
 Person2:Thanks . I'll let him know . 

informal