A little to none of eye contact
Small rushed sentences
You know that both of you are more than dlighted to meet but still...it doesn't seem that way
Bottom line. It is clumzy and ackward
Special Request to people in public transportation:
when someone wants to sit next to you and say 'assalamo3alykom' , please reply ' wa 3alaykom ssalam'. Chill and don't be afraid to show the wrinckles in the corners of your eyes.
Just Smile, it's sunnah :)