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:       Shall we have two tickets for for seven thirty ?  
 Person2:Yes , Would you like to have the seats in the front or at the back ?  
 Person1:        In the front , please . 

formal