Learn English – Word to describe the caring of the seller for the buyer

A buyer and a seller come to a trade agreement. During the discussion, the seller (whose product is good quality) shows that they are a generous person, like so:

• The buyer expresses that although they can handle the original price, a little discount for each product would make the total more affordable. The seller agrees to a discount.
• The buyer requests that due to the time it takes for delivery, the products be sent at once. However, the buyer says that the money can't be sent at once because, even though a discount has been agreed, the sum total is still large. The buyer requests instead that the money be transferred in monthly installments. The seller agrees to both of these requests.
• Eventually however, despite the seller having accepted all the requests of the buyer, it transpires that the buyer has to buy an alternative product from a different seller. The seller understands the situation and kindly allows the buyer to cease the transaction without incurring any costs, penalties or obligations.

Thanks to this generous conduct, the buyer wants to thank the seller. What would be an appropriate term to use in these circumstances?

Thank you so much for your _______

I know that kindness, caring or help would fit, but I want to find a more specific word or phrase.