I want nothing of that sort ...you really do sell love potions?
Here is a liquid as colourless as water, almost tasteless, quite imperceptible in coffee, wine, or any other beverage. It is also quite imperceptible to any known method of autopsy.
That is love!
Give one tiny measure of this to the young lady ... she will change altogether. She will want nothing but solitude and you.
I like to oblige...Then customers come back, later in life, when they are better off, and want more expensive things. Here you are. You will find it very effective.
I can't tell you how grateful I am!
This moment is significant because it introduces the tasteless potion and gives the reader a hint that it could be dangerous. It sets up the old man as a shady character, and also reveals that Alan really wants - a love potion.
This moment is significant because Alan feels like he will get everything that he wants, and it seems like the old man will be successful in selling him the potion. This is where the conflict between Alan and the old man is at it's most exciting.
This moment is significant because the exchange between Alan and the old man is coming to an end, and both characters feel like they have been successful. Alan believes that he will be happy with Diana forever, and the old man believes that Alan will be back for the second potion.