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:       Tom and Helen got married at last .  
 Person2:How did you know that ? I heart Tom ’ s father didn ’ t agree with that .  
 Person1:        I was invited to attend their wedding .  
 Person2:It ’ s great . Although his father didn ’ t agree with that , Tom went through with it .  
 Person1:        How moving love is . 

informal