Hello. Thanks for viewing the listing.
Hi! I was wondering if you would be able to unlock my mobile phone? I seen in your ad that you had this available? 
Yes, I can do that. What kind of phone do you have?
It's an Alcatel from T-Moble. And what is the charge for unlocking a phone? 
The charge for that would be $40
Oh. But I am on a tight budget at the moment. Would you perhaps be willing to to do it for $20? 
I'm sorry but I can't accept $20. Would you be able to do $32?
It's a little bit of a drive to get to your area. what about $30? Please! 
That will work. Or make it $31 and I'll bring it to you.
Okay! Sounds great. See you soon.