"Hi Would You Like To Talk To Me About Dinosaurs?"
Missy had been surprised to hear her DiePhone ring, and was even more surprised at the sound of a child on the other end of the line. Dozens of questions flashed through her mind; how did they get this number? Where were their parents? Why hadn't anyone taught them about Stranger Danger? Was this the Doctor playing some kind of prank on her? Or more likely, the Master playing some kind of prank on her? She couldn't just ask a child those things though. Perhaps if she obliged their request she could figure it out through inferences along the way. Besides, she was actually interested in hearing their opinions on the ancient Earth creatures. Human children tended to be more knowledgeable about them than the average human adult.
"Alright then, let's talk about dinosaurs," the timelady answered, curious, putting them on speaker so she could look things up on her tardis' computer if she needed to. "My favourite is the velociraptor. What about you, dear?"