Help me check if the dialogue is stilted( that is, unnatural) . I will also love to get some reasons for that. Thanks.

[Temidayo]

Dave walked into Amber's office. Marcus, his supervisor, had summoned him there. The last time he entered her office, he recalled, was when they were still working together; this was few months ago.

“Dave, I was discussing a new project with Amber,” Marcus said. “I’m thinking of handing the project over to both of you, what do you think?”

“Sir—” he paused. 

“Yes, Dave.”

“Sir, you know I have problems working with Amber, right?” 

“You think I don't know that, Dave?” Marcus asked.

“I split you guys up to different teams myself, you remember?”

“Yes, I recall that.”

“Then you should know there is an ulterior motive behind this,” Marcus said. “And besides, I did that so you guys could cool off, It wasn't meant forever.”

“Do I have your consent?” Marcus asked.

Dave averted his gaze away from Marcus. He couldn't bring himself to consent to a teamwork with Amber. Not again. Looking towards her now, she appears unconcerned. Her fingers which she kept fiddling with seemed to hold her attention. Whatever she was thinking of, he couldn't tell.The last time he had worked with her, they were for most of the time at loggerheads with each other. He had felt stressed out after the project ended. He and Amber had known each other since college; their relationship back then was not any different either. 

“What about Amber?” Dave asked.

 “Do I have yours?” Marcus asked, turning towards her.
 
Silence. 

“Okay, since you guys aren't willing to respond, I will make the decision,” Marcus said.“Both of you are going to work together on the project, is that okay?

Dave gave a nod, knowing he won't be able to convince Marcus otherwise. He could tell the unspoken words as his gaze came to meet Marcus’.

Don't screw up.