I am a handquilter for hire and I don't get many customers. A non-quilter has no clue what goes into making a quilt. The only people I make a quilt from scratch for are those I choose to gift with my creations or our local senior center. I am just finishing up piecing a top that will be quilted by the ladies at the center and I won't volunteer for that again. I have no problem quilting someone else's top but not for free unless it is a chairity.
The best thing you could do if the person is serious is take them shopping. If they are willing to purchase all the materials needed for the quilt including thread, batting and even marking tools, quilt stencils etc. then they may be willing to pay you for your time and expertise. Don't pay yourself less than $10 an hour and be realistic about how long it will take you. Just because I am watching TV or engaged in conversation with my husband while quilting doesn't mean I am not working.