Also, and this is something I hear time and time again from editors, LEAVE TIME FOR THEM TO ASK QUESTIONS at the end. If you have a ten minute appointment, here's how I'd suggest you use your time:
1. Tell the editor your NAME. Give them a business card if you have one. Then, ask for their card. Cards are valuable resources because they have addresses and phone numbers for later. Write the date and time of your appointment, as well as the name of the conference you're attending, on the editor's card AFTER YOU LEAVE the meeting.
2. Tell the editor the subgenre of your book.
3. If your book is an odd length (like 88,654 words) just say, "around 90,000 words," and mention you can add or trim the story to fit the line. That says you're willing to make edits to make the book saleable.
4. Tell the editor the TITLE of the book. You wouldn't believe how many people forget to mention that. You might also write the title on the back of the card you give the editor. Conferences are tough on editors. Give yourself and your book every advantage you have.
5. Tell the editor the same basic one paragraph plot you'd use in a query letter. It should encompass the whole of the book--from tone (light or dark) to the character's names, to why the characters are unique and what the conflict is. So, GMC right up front--goal, motivation, conflict. Who are the characters, why must they go on when the going gets tough and what/who tries to prevent it.
6. Pause. Let the information sink in for a few heartbeats. The editor might or might not seize on the pause to ask a question.
7. Now, if there's still time and the editor doesn't have any questions, you can go into more detail about the plot. Skip subplots unless they're critical to either G, M, or C.
For example, here's a pitch I did for our stand-alone novel MAGIC'S DESIGN when at a lunch with our old editor, who was leaving, and our incoming editor. Of course, I already knew them, but I'll insert what I'd say if I didn't:
Hi, I'm Cathy Clamp. Here's my card with all my contact information. Do you by chance have a card with you? Great. Thanks. Okay, I write paranormal romance with some urban fantasy elements. The manuscript I'd like to tell you about today is called MAGIC'S DESIGN. It's about 100,000 words and is set in today's world, where magic doesn't really exist. My heroine, named Mila, has a Ukrainian background and one of her hobbies is making pysanka--which are those really intricate Easter eggs. She's a legal secretary and has been plagued her whole life by epileptic-like seizures where she doesn't remember periods of time. What she discovers is that the 'seizures' are actually magical attachments to a realm of mages and witches which is under the earth's crust. There really are a lot of people, even today, who believe in the 'hollow earth theory' that says a magical race called the Argathans live under the mantle of the earth. The hero is Talos, and he works for the magical police force that keeps the two realms separate. A convict--one of the most evil mages in their world--escaped from prison to the surface and winds up coming out a portal in Mila's house, which gets her stuck right in the middle of the end of everything around her. She discovers magic she didn't know she had, that are based on the designed eggs, and she and Talos have to work together to capture the convict before he destroys both worlds. Unfortunately, it turns out that Mila's magical clan was banished from the underground world and everybody thinks they're corrupt and contagious with a horrible disease, so it's not going to be easy, even though they're immediately attracted to each other because of complimenting magic.
That's about five minutes. If there's time, I would explain some background about how I used logic of existing history to make an underground world believable. (Magic used to exist in medieval times, and the Black Plague was actually a mutated MAGICAL plague. The humans barely survived, and threatened to destroy all the magicians unless they exiled themselves.) and how the eggs create all the magic in the world.
One or two more questions later, and my editors LOVED the concept and decided to make it part of the next contract.
Short and simple and since you already love the book, that will come through in what you say.
Good luck and CONGRATS!