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:       Is there anything available for tonight ?  
 Person2:There are some seats in the rear mezzanine .  
 Person1:        Isn't there anything else available ?  
 Person2:No , the show is almost sold out . 

formal