Detailed 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'.
Q: Person1: I ' d like to make a collect call to Beijing China , please .
Person2:What ' s the number you are calling , please ?
Person1: The number I am calling is 86-10- 4016-9988
Person2:What ' s the name of the person you are calling ?
Person1: Marty Smith . M-A-R-T-Y , S-M-I-T-H
Person2:Thanks . What ' s your name and phone number , please ?
Person1: My name is Jennifer Smith . My phone number is 610-934-9901 .
Person2:Thank you . I ' ll put the call through for you . Hold on the line , please .
A:
informal