@Account Closed You don't need any of that. This isn't a listing appointment where you're trying to sell the seller on hiring you.
If you haven't already done so over the phone you need to ask them questions so that they voice their pain point (can't afford payments) and the situation causing that pain (death/divorce/disease/job loss). Then you offer your solution (take over payments). If they're truly motivated they will usually have 1 or 2 minor questions and if you answer those confidently and satisfactorily, they'll sign.
Here's a rough transcript of an actual appointment I was on and is typical for sub2 appointments:
ME: "Thank you for inviting me over to buy your house!"
SELLER: "No thank you!"
ME: "Would you like to give me the grand tour?"
SELLER: "Sure!"
After the tour, sitting down at the kitchen table:
ME: "You mentioned on the phone that the payments were becoming a problem for you."
SELLER: "Yes. I bought this place with my girlfriend last year and right after we moved in I found out she was cheating on me. Then less than a month after we broke up I lost my job. I've gone through all of my savings and even borrowed money from my dad to pay the mortgage but I haven't been able to find another job that pays enough to keep it. I called the agent that helped me buy it but she said I don't have enough equity to cover the commission to sell it. So now I just want out, I'm thinking about letting the bank just take it back."
ME: "I'm sorry to hear about everything you've gone through this last year. Would it help if I took over your payments?"
SELLER: "Oh my god YES! Can you do that? I mean I owe more than the house is worth."
ME: "No problem. The mortgage will stay in your name until I refinance which I will do when there's enough equity."
SELLER: "This is great. What's the next step?"
And that's when we signed the purchase agreement.