Instructions: 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: I ' m really glad I got a chance to talk to you before you left , Mary . Have a safe trip !
Person2:Thanks . Try not to work too hard while I ' m away !
Person1: Yeah , I ' ll try not to ! See you after Christmas .
Person2:Okay-bye ! Have a nice Christmas .
Output:
informal