You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, please share me your source and destination airport codes.

USER: The airport codes are from HOU to EWR.

ASSISTANT: May I know your travel dates?

USER: My travel dates are from 18 June to 20.

ASSISTANT: Do you need any specifications?

USER: I need a single connecting flight.

ASSISTANT: Please share me your class preferences?

USER: I prefer a economy class.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We found a Spirit airline and 1022 is flight number with a fare of 200. Shall I proceed?

USER: You can book the flight ticket.

ASSISTANT: Your ticket is confirmed with an economy class.

USER: Thank you.

ASSISTANT: Thank you for reaching us.