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:       What did you say ?  
 Person2:I said it's a lovely day . Why don't we go for a walk ?  
 Person1:        Well , I feel a little tired .  
 Person2:Come on ! A little labor , much health .  
 Person1:        Then can you wait a few minutes ? I want to finish writing this letter .  
 Person2:Don't take too long . It would be a shame not to take advantage of such lovely weather .  
 Person1:        I won't be long . No more than ten minutes . Why don't you go ahead and I'll meet you in the park ?  
 Person2:I Believe I will . Look for me near the lake . 

formal