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 . I'd like to get a seat to New York City on a flight leaving sometime before this Friday .  
 Person2:I'm afraid Thera isn't any direct light before Friday . What about a non-direct one ? You have to make a change in Detroit .  
 Person1:        Well , in that case , that's fine . I want a first class ticket on Thursday .  
 Person2:Would you like to pay in cash or by card ?  
 Person1:        Cash , please . 

formal