What plans does Holden make with Sally in The Catcher in the Rye by J.D. Salinger?

The only plans Holden makes with Sally Hayes are for him to come to her house and help her decorate her family's Christmas tree. When they are sitting at a table by the skating rink in Chapter 17, she says,

"Look. I have to know. Are you or aren't you coming over to help me trim the tree Christmas Eve? I have to know."

Holden replies,

"I wrote you I would. You've asked me that about twenty times. Sure, I am."

Then Holden comes up with a truly wild plan. He wants Sally to run away with him immediately. It is not too different from his fantasy about being a catcher in the rye.

"We'll stay in these cabin camps until the dough runs out. I could get a job somewhere, and we could live somewhere with a brook and all and, later on, we could get married or something."

Holden has assets in the bank of about $180. Sally would not for a moment consider such a wild suggestion. Holden himself realizes that he doesn't even like this girl, and he can't understand why he is saying what he says. holden and Sally end up quarreling, and it looks as if he won't even be coming to her house to help trim her Christmas tree. 

In Chapter 17, more than anywhere else, Holden vents his hatred and disgust with everything. Perhaps he knows Sally better than most of the other people he deals with in the book. They appear to have known each other for a long time and to have some sort of very fragile bond because they have done a lot of necking and have been on a number of dates. Despite the time she has spent with Holden, Sally is a million miles away from sympathizing with Holden's feelings about the world they live in. She is fairly content with things the way they are. She is far from being a rebel like Holden. She is truly admirable in the sensitive way she listens to him and handles his tantrum. She may be a phony, but she has some very good qualities, which Holden may appreciate on some unconscious level. It may be because he knows she cares for him a little that he confides in her and makes his wildly impractical proposal to run away together and get married on $180, especially when he is only sixteen and she is similar in age.

We can sympathize with Holden for wanting to break free, but we can also sympathize with Sally, who not only has more sense than Holden but also handles him so diplomatically. In the end, they have not really planned anything. It was his plan to go see Alfred Lunt and Lynn Fontanne. It was her plan to go ice-skating at Radio City. It was his plan to run away together to Massachusetts or Vermont. Holden seems to get along better with Sally Hayes than he does with most of the characters in the book, yet they end up hating each other. Much of The Catcher in the Rye is about Holden's disappointing encounters with other people. The only person with whom he seems to relate successfully is with his little sister Phoebe.