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:       Good morning , Jerry . How's everything ?  
 Person2:Fine , just fine . Thanks .  
 Person1:        Doing anything for lunch ?  
 Person2:Well , as a matter of fact , I've got a lunch date with Bob Thomas . 

formal