In addition to the above reception, you can try and another.
You start with a small query, to which you agree, and then increase the size of this query.
This technique called "throwing a low ball" is often used by sales managers. Perhaps you yourself were a victim of this tactic, for example, in a car showroom, where it is often used.
You just agreed with the seller about the good conditions for buying a new car, and he goes to his workplace to issue papers, and you rejoice in a fantastically successful transaction. In fact, the manager probably does not make out anything, but just waits a few minutes to give you a dream about a new car.
When these few minutes pass, he returns to you with unpleasant news: the director did not approve the deal and the price of the car will be higher by $ 500. But by that time you have already caught fire and given the initial agreement, and now you are experiencing internal pressure, which forces you to agree to new, less favorable conditions.
You have already presented how you are traveling in a new car, and allowed yourself to really want it. As a puppeteer running a puppet, the seller pulled the strings of cognitive dissonance and practically forced you to accept unfavorable conditions.