急需一篇英语情景对话范文，两个人的，每人3-5分钟的内容

"Oh,hi mate! How are you these days?"
"Just so so, more or less.And you?"
"You know, I'm studying about the topic of dinosaurs. It's really a stuff!"
"Oh? What subject are you working on?"
"About the extinction of dinosaurs.Fantastic, isn't it? Those once-overlords disappeared on the earth in a very short period, but no one knows what happened actually!"
"That is.. What do you think?"
"Think what? About the mysterious diappearance of those extremely tremendous creatures?"
"Yes!"
"Yum! Tell me about your ideas first!"
"Eh.. Climate? I think I heard it many times on TVs"
"Yeah! The sudden change of the temperature. It went cooler and killed them off! That's the most common explanation, but it sounds dull to me! And more?"
"Then, the lack of food? Those dinosaurs ran out of food, and couldn't bear the hunger anymore so they all suicided?"
"A little more imaginative this time, but not enough!~"
"..., tell me, old man, what's your explanation or research!"
"In my report, the dinosaur extincted by the invasion of the aliens!"
"Pardon, the what?"
"The aliens! The attack from the outer space! The dinosaurs were destroyed by battlecruisers of them!"
"Have you read too much science fiction yesterday? This idea sounds crazy to me!"
"Well, I do collect many evidences from various kind of materials to support this opinon. Crazy? Yes I think it's really a little, but who cares! Most of the gifted-scientists were also regarded as mad when them hadn't got fame!"
"Ok ok! I'll be at your side whatever you do!"
"Thank you very much my dear brother! I'm moved by your words :)"
"Oh, just forget it!"

嗯，即兴编了一段..不过要讲五分钟似乎有点困难，楼主可以自己再往上加一点喽！祝你好运！