Un diálogo es el intercambio de ideas entre dos o más personas. Por lo que lo que al parecer necesitas es un monólogo o una exposición en inglés. Calculando un promedio de 120 a 150 palabras por minuto, un ejemplo que podría serte útil, puede ser el siguiente:
Hi friends. Today I am telling you some things from my past y how that are influencing my actual life.
I was born in México, in a little town called Tequila, in Jalisco State. I been living there since I was six. Then my parents decided to move house to the Capital, Guadalajara. In that town my brothers and sisters, and I, of course, began to study the elementary school, that in Mexico is divided in two parts, called primaria (primary) and secundaria (secondary). In that period of nine years, I learned a lot of things, not only of the academicals, but specially to meet the people.
In the school was a very poor childs, whom only was using a light clothes made of a light cotton stuff called manta, and use a pair of sandals called huaraches, made with strop and a piece of car tire. Anyone of them used socks. We were, to say so, in the middle. We used clothes made for our mother, only released shoes once a year. Well, there were rich childs too. They used nice clothes bought in the stores, and a new pair of shoes every two or three months, also used other things that anyone of us can obtain: gold chains, imported toys, and many other things.
Despite of this, the groups was relatively peaceful and no were great troubles.
The shock came when I studied pre universitary level. To study in the preparatoria school, my parents sent me to Mexico City, with my uncle Anastasio. The first day I take class, all the people were too different that I meet: almost all dressed similar, and most of them were to busy, like desperate. When they seem me, there was a mixture between strangeness and indifference. At the end of the day a group of students come near to me and others around and become to demand money. They were five, and we were around ten. One try to refuse, but one of the bouncers hit him and sent him to the ground. The rest were afraid. Then go front a petite small girl, no more than one and half meter. She said them: “What do you want?”. The bouncers laugh of her, then one cry: “Your money”.
She so tranquil said him: “No”.
“Are you going to stop us?” said the boss of the bouncers.
“Yes” said the girl.
“Go with your mommy, baby” said the boss.
“Let we go” she said.
“You’re so brave. Are you going to hit me? I don’t mind hitting a woman”.
“Try it” said her coldly.
Angry, the boss threw a punch to the girl directly to her face. In an instant, she moves aside, moved her arms and sent the boss to the ground. Angrier, he gets up and tried to kick her, she moved aside, took his leg and made him fly around two or three meters.
The boss got up aching and cry his guys “Let’s go”.
I couldn’t believe what I was seen. Everyone followed its own way, and I followed the girl. When I was near, I say her: “Thanks”.
“You never mind. It was easy”. She said.
“How do you that?” I asked.
“That was aikido boy”. She said.
“I want to learn” I said.
“I’ll teach you” said her.
Now, my friends, that’s the reason since then I am studying aikido. With this girl we both are going to High school and we are finishing our studies in three months. I like to know why you are coming to the gym, and why you are coming to High school.
Espero te sirva.