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:       You went out on a date last night , didn't you ?  
 Person2:Yes , I did , but Linda stood me up . She didn't keep the date for the first time .  
 Person1:        How come ?  
 Person2:I don't know .  
 Person1:        Why don't you phone her for a date again ?  
 Person2:I did phone her this morning , but she hung up on me . I think she is going to walk out on me .  
 Person1:        Don't jump to conclusions . Look at the bright side , try to make another date again .  
 Person2:I will . Thanks for your advice . 

informal