Conversation is a challenge for many on the ASD spectrum, due to problems understanding non-verbal cues and unspoken rules. This video is an excerpt from a longer talk by Don Gabor of The Learning Annex. It gives some quick useful tips on starting and managing a conversation:

1) Ask an easy-to-answer open-ended question (without a “yes” or “no” possible answer).
2) Make a positive comment.
3) Offer sincere compliments.
4) Refer to something the person’s said to make a connection.
5) Stop focusing on yourself and your inner monologue, instead, LISTEN!

[Quoted from the YouTube page]