Difference between Dialog and Conversation

Dialog	Conversation
https://en.oxforddictionaries.com/definition/dialogue	https://en.oxforddictionaries.com/definition/conversation
Dialogue is between two persons	Conversation is talking between two or more persons
Most part of the dialogue includes Questions and answers, requests and information	In talking you can say everything, even you can joke, you can tell a story, you can laugh
Dialogue is a conversational exchange between two people	Conversation is informal interchange of thoughts, information, etc., by spoken words;
Dialogue is for purpose.	Conversation is interactive, more-or-less spontaneous, communication between two or more conversant. Interactivity occurs because contributions to a conversation are response reactions to what has previously been said. Spontaneity occurs because a conversation must proceed, to some extent, and in some way, unpredictably.