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 , Tom !  
 Person2:Hello , Steven !  
 Person1:        How are you doing ?  
 Person2:Not bad . What about you ?  
 Person1:        I'm just a little tired .  
 Person2:Why ?  
 Person1:        I have a lot of work to do in the company recently .  
 Person2:How is your family ?  
 Person1:        Pretty fine , thanks .  
 Person2:Where are you going now ?  
 Person1:        I am going to buy a new air conditioner for my parents . Oh , it ’ s two o ’ clock . I must go now .  
 Person2:OK , see you next time .  
 Person1:        See you . 

formal