Hello, how are you today? 
I'm good, and I am interested in purchasing your bicycle. 
Wonderful. It is a really fantastic bike, I just don't ride it enough. It deserves to go to a home where it can be appreciated fully. 
Oh ok. What kind of condition is it in?
It is in like new condition. I bought it and rode it less than 20 miles total. 
That's good. How long have you had it?
I have owned it for about a year. I bought it brand new. Thought I would be able to ride it more. 
Oh ok. I love the bike but do you think we can go a little lower on the price?
It does have a lot of aftermarket extras. I could go a little lower, but not too much. What are you thinking? 
What about 900
900 is faaaaarrrrr below market value. I could not go that low. The only way I can negotiate is if I knew about your rental history and willingness to sign a 2 year lease. Anything past 2 years, I am leary of. 
Ok how about 1050?
And I thoroughly confused you! I am so sorry! how about we split the difference and go with 1,000? I will even meet you in a central location and that works for both of us. 
That sounds good, thanks!