From a Story

I think the only background information you need to know for this excerpt is that Laila and Greg used to date, then their relationship took a turn for the worse. They brok up, but are now back together and going on a trip with their best friends. I apologize in advance for the length, but it is necessary for my questions.

"Laila," Elle whispered.
"Hmm?"
"Can I sit near the window?"
"Sure. I'll take the aisle seat."
"No!"
Greg raised an eyebrow at the girls who were walking in front of him on the plane. He wasn't really sure why they were whispering, considering that everyone near them was packed in so closely that if they were listening it would be no problem to hear what they were saying.
"Why not?" Laila asked quietly.
"Well... why can't you sit in the middle?"
"Because I already feel like I'm going to die on flights! Let's not add being squeezed between two people to it!"
"Laila, you're not even claustrophobic!" Elle hissed back.
"No, but I'd at least like to be comfortable when we're 30,000 feet in the air and in the event that anything goes wrong we will plummet to our deaths!"
"That is completely irrational!"
Subtly, Greg glanced over his shoulder to see if anyone was staring at the two girls bickering in hushed voices.
"So why don't you want to sit a seat away from me?"
"I just... it'd be awkward to sit with Greg," Elle said so quietly the aforementioned brunet could barely hear her.
"Why? What's wrong with him?" Laila snapped back defensively.
"It'd just be weird!" Elle whine.
"You do realize we'll be sharing a hotel room, right?" Laila asked. "If just sitting with him is awkward..."
"Shit," Greg muttered.
If Kevin crashes this trip... Ugh! We'll have to share a bed! Well... maybe... No! Why was I even considering that not being terrible?!
During Greg's peroid of inner turmoil, it seemed the girls had settled their differences. Elle took the window seat and Laila say next to her in the middle of the row. Greg frowned slightly. Was sitting with him really so bad? He sat down next to Laila, suddenly self-conscious.
The pilot gave the usual song and dance about safety precautions and then everyone fastened their seatbelts. The engine roared into life and settled into a dull purr as the plane began to cvoast down the runway.
Greg felt a hand slide into his own and he glanced to the side at Laila. She was staring at her lap, but gave him a quick, embarrassed look. He gestured at his shoulder with a gruff head nod and the brunette buried her face against him.
Heh. It's not so bad sitting with me.
Once the plane was in the air and flying smoothly, Greg leaned forward to look at Laila's face. It appeared she had falles asleep shortly after takeoff.
"I don't think she slept well last night," Elle said, noticing Greg's confused look.
"Ah," he replied. "Just last night or... a lot lately?"
"A lot. She won't tell me what's wrong, but I know you have something to do with it," Elle answered, blue eyes narrowing dangerously.
Greg made a mental note to never anger the blonde and innocently replied, "How do you know that?"
"I have my ways."
"Oh? Was it your ways that told you that it'd be a tragedy to sit next to me?"
Elle's face flushed slightly and said, "That's irrelevant. What's going on with you guys?"
"Same old things, but better. Happier. Don't you guys talk about stuff like this?"
"So you aren't always mad at her?" Elle inquired coolly, ignoring his question.
"No," he answered. Then, lowering his voice, he added, "How much do you know about what happened last time?"
" I know you were always mad at her and used your anger and her guilt to your advantage. What else is there to know?"
"Nothing," the brunet lied.
Elle looked suspicious and opened her mouth to reply. Luckily, Laila woke up just then and Greg let out a sigh of relief.
"Are you two fighting?" Laila asked, blinking sleepily at them.
"No," they replied in unison. Then Greg added, "Go back to sleep, Lai."
Laila shot each of them a skeptical look, then rested her head on Greg's shoulder again. He placed his head atop hers and feigned sleep, determined to avoid further questioning.

Are these characters real? Does this seem cliche? And does the slight, subtle humor come through to lighten the scene at any point?