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:       It's the Cygnet Trust .  
 Person2:Could you spell that please ?  
 Person1:        Of course . C , Y , G , N , E , T .  
 Person2:Cygnet . OK , I've got that . 

informal