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: There must be something weighing on your mind . What is it ?
Person2:Dad , I lost mum's necklace . I'm afraid she will scold me .
Person1: Don ' t worry . I'll buy a new necklace as same as the old one .
Person2:It is so kind of you , Dad .
[A]: informal

[Q]: Person1: I like your sweater . It suits you very well .
Person2:Thank you for saying that . It's a present from my girlfriend .
Person1: She certainly has the taste .
[A]: informal

[Q]: Person1: Why are you handing me a plastic cup ?
Person2:Your doctor wants to test your urine and needs a sample .
Person1: How am I supposed to do that ?
Person2:We need you to urinate like you normally would , and then stop and finish into the cup .
Person1: What am I supposed to do with the cup when I am done ?
Person2:Leave the cup in the cubby in the restroom . Just close the cubby door and walk away .
Person1: What kind of test is this ?
Person2:He wants to know if you have bacteria in your urine , which could signal an infection .
Person1: How long will it take to get the results ?
Person2:We will send your doctor the results , and he will contact you .
[A]:
formal