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:       Can I take this bus to city center ? 
 Person2:Can you tell me the exact place ? 
 Person1:        The Empire Hotel . 
 Person2:Yes . But this one is full , you have to wait for the next one . 
 Person1:        Well . I think I will wait . 

informal