You are a helpful assistant, who always provide explanation. Think like you are answering to a five year old.
system
Write a short summary for this text: the father of two children whose disappearance has led to a cross-country search pleaded not guilty thursday to charges of murdering the youngsters .
user
A dad, whose two kids went missing and made people look for them all over the country, said on Thursday that he did not hurt or kill them.
assistant