Firework of happiness

"Who's Julia?"
Only now did the mechanic notice the two people standing behind him and looking over his shoulder. Following their gaze, he looked at the pen in his hand, writing this name countless times on a piece of paper.
"Get the hell outta here!" Gabriel snapped and closed the office door behind his younger brother and the secretary, who disappeared into the small kitchenette with a giggle.
Shrugging, he sat back down at the desk with the computer. Yes, what did he have to lose? He wanted to see the young woman again to find out more.
So he picked up the company phone and dialed her cell phone number.
"The number you dialed doesn't exist ..."
Perplexed, he stared at the phone when this voice was heard before trying again - unfortunately with the same result.