Hello
Hi there, I am interested in the LG Viper.
Great! It is in superb condition. I've had it for about a year and I am a fairly light user.
It looks like it's in good condition. The only issue is that I really need a phone and I don't have $55 on my today. I was wondering if you'd be willing to negotiate on the price a little bit?
Depends what you have?
I'd really like to pay $45. 
Why don't we go with the middle and call it at $50?
Does it come with a charger?
Yeah, charger, screen protector already on, and an extra battery.
Hmm. Will you agree on $48?
Nah, 50
Ok, $40 is fine.
No
I mean to type $50 lol, sorry.