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:       Would you mind waiting a while ?  
 Person2:Well , how long will it be ?  
 Person1:        I'm not sure . But I'll get a table ready as fast as I can .  
 Person2:OK . We'll wait . 

informal