Using 'bonjour' is a good idea. Then you can ask questions or talk fo any subject you like. Subjects for opening a conversation between persons who don't know each other are often mundane (speaking of the weather for instance), just as it is done in English.
un conversation longue.
"Let's have a conversation" in French is "On se parle".
well if you sit by him and he dosn't talk to you start a conversation
how do you start an intresting conversation with a girl you really love
'conversation'
To start conversation with a single-eyed person, first get to where he is seated, grasp his attention, and then engage him in a conversation.
just start talking
conversation téléphonique
You learn how to speak it...
"Je parle un peu français, mais pas assez pour avoir une conversation" I speak a bit french but not enough to have a conversation.... Simple as that.
Une conversation à la station de train
Start with "Hi"; and tell him you like his shirt (or whatever) and as him where he got it.If that doesn't start a conversation then you aren't trying.