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:       May I please speak to Tom ? 
 Person2:Tom has gone to lunch . 
 Person1:        I'll just try him again . 
 Person2:Do you want me to have him give you a call ? 
 Person1:        No , but what time do you expect him back ? 
 Person2:He should be back in about forty minutes . 

formal