You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I would like to prefer a economy class for my business trip to Detroit. So can you book the flight ticket for me?

ASSISTANT: Sure, may I know your name?

USER: I am Joseph Green.

ASSISTANT: Can I know your travelling dates?

USER: The travel dates are from May 01 to May 03.

ASSISTANT: May I know your airport codes?

USER: The airport codes are from IAH to DTW.

ASSISTANT: Do you prefer a connecting flight?

USER: I prefer a stopover flight.

ASSISTANT: We found a flight of frontier airline, flight number 1001 with the fare of 200.

USER: You can book the flight ticket.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you.