You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am William Lewis.

ASSISTANT: How can I be of your service?

USER: I want to go for shopping at Dallas, please book a flight ticket under price 200.

ASSISTANT: Sure. Can I know your travelling dates?

USER: My travelling dates are from 06/14 to 06/16.

ASSISTANT: Please share me your airport codes.

USER: I want to fly from HOU to DFW.

ASSISTANT: We found a Spirit airline, flight number:1028 and the price is 200.

USER: Please proceed.

ASSISTANT: Your flight  ticket has been processed.

USER: Thank you for the reservation.

ASSISTANT: Thank you.