My name is Mastiff and I'll be reviewing your piece. These are just my thoughts and forgive me if I ramble, and realize I make just as many mistakes as anyone else. Thank you for sharing your writing, and I hope this is helpful!
Title: The title is very enticing. It's one of those that you aren't sure where you're headed, but you want to go. I would, though, be more careful with the subtitle. It gives away too much, especially in a short piece. I would probably make it more cryptic.
Initial Reaction: It was enough to make me want to keep reading, and that's what you want to accomplish. This is part of I Write 2020, so I would have in any case, but I may have reviewed it anyway as well.
Setting: It's hard to add a setting in a dialogue only story. It's not impossible, it just has to be told by the people speaking. You give a few glimpses, like a crowd and a float, but we're left wondering if they are at some kind of circus or parade. I think you could push this aspect a little harder and give readers a better picture of the surroundings.
Character Development: It's a little easier here, but still needs more description. It's short, so there isn't a lot of room to add much, but some small additions could make it pop.
Plot: It's unusual. There are some spots that you could smooth out to make it flow easier. In fact, a few more line breaks, particularly where Phil disappears, might help. It was almost like shifting gears without a clutch.
Ending: An interesting, but odd, turn of events. I certainly didn't expect the girl to be in a coma.
Line-by-line and Suggestions:
Para. 1 Ln. 6 - I'd have probably used a question mark instead of ellipsis.
Para. 1 Ln. 8 - I think you want "what" instead of "where."
Para. 1 Ln. 9 - I use ellipsis quite a bit in dialogue as well, but it's not needed here.
Para. 1 Ln. 10 - Comma after "months."
Para. 1 Ln. 12 - Consider moving the "so" to the spot just before "addicted."
Para. 1 Ln. 20 - I have no idea what the "Whoof" is all about. If it's Phil disappearing, you need something more suitable.
Para. 1 Ln. 21 - Try something like, "Phil?! Where did you go? And... who the heck are you?!"
Para. 1 Ln. 27 - Using all caps is a bad way to emphasize. Use italics instead. Italicize "everybody" as well for even more emphasis.
Para. 2 Ln. 2 - Have the doctor use a name so we know who is in the room with him.
Overall - You have a little work to do, but it's not too bad.
Adherence to Contest Rules: I'm thinking this might have been an entry into The Dialogue 500. If it was, you seem to have accomplished the goal. However, when you use dialogue, you really need to put all of it in quotes. If it didn't have to be all talk, you probably missed several opportunities to beef up the story. Also, always read the lines to yourself. A few sound a little stilted, and not how people in a conversation would actually talk.
Overall Opinion: I'd enjoy seeing it a little longer to add in some setting work and more character development, and also using more than dialogue, which would help with that as well. It has potential if you ever want to expand it.