I would like to set up a response, via Push Notification, in my app. 

User A sends User B a message.

User B opens the app (through the push) to a new page.

User B sends User A a response (as a push).

Right now I can open to the page, but I'm not sure how to get the data I need.

Here's what I get from Parse from the first push:

```
userInfo: {
    aps =     {
        alert = "demo says HELLO WORLD";
    };

```

In this case, demo is the username of the user that sent the first push. I'd like to get that, so that the app for User B knows who to send the reply to.

Here's my Push Code:

```
    PFPush *push = [[PFPush alloc] init];
    [push setQuery:pushQuery];
    [push setMessage:[NSString stringWithFormat:@"%@ says HELLO WORLD", [PFUser currentUser].username]];
    [push sendPushInBackground];

```