Solve the puzzle with reasoning please:

Random Guy A:Life is hard isn't it?
Random Guy B: Why, what happened?
Random Guy A: Well that doesn't matter. What matters is how we solve the problem.
Random Guy B: So what should we do?
Random Guy A: Well there is nothing much to do except mving frward.
Random Guy B: But isn't that painful? Random Guy A: At first it is, but days will go like one, two, thwee and eventually you will get a grasp of it and all the Itters in your life will come back to normal.
Random Guy A gives Random Guy B a page having this code: TBTFIIBPZXMB

Random Guy B: What is this?
Random Guy A: Something that's gonna inspire you for the coming
days.
Random Guy B: But this doesn't make sense.
Random Guy A: Everything does, you just need to find a way to
decode it.
Random Guy B: But HOW?
Random Guy A: Just look back at our conversation. I think you'll
find it. Won't you reader...