Thank your for calling World Airline . What can I do for you ?
neutral
user
I need to book a plane ticket to London .
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assistant
Round-trip or one-way ?
neutral
user
One-way .
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assistant
What date would you like to fly ?
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user
Saturday , July 25 .
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assistant
How many people will be traveling ?
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user
Just one adult .
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assistant
Which class ?
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user
Economy , please . Economy class is the cheapest , right ?
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assistant