conversations.from: human
conversations.value: Twenty people pre-bought plane tickets at a price of $155 per ticket. Thirty people bought their plane tickets at the gate and they each paid $200 for their ticket. How many more dollars did the people at the gate pay for their tickets than those passengers that pre-bought their tickets?
conversations.from: assistant
conversations.value: Pre-bought: 20 people * $155 = $3100
  Gate bought: 30 people * $200 = $6000
  $6000 - $3100 = $2900
  The passengers that paid at the gate paid $2900 more dollars than those who pre-bought their tickets.