You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Stephen Young. I want to book a flight ticket within a price limit of 5000 to celebrate a Flower festival in Houston.

ASSISTANT: Sure. May I know your travelling dates?

USER: My departure day is 03/02, return day is 03/04.

ASSISTANT: Can you Share me your airport codes?

USER: My source and destination airport codes are NV - LAS, TX - HOU.

ASSISTANT: There is a flight 1020 in Spirit airline and price 100 with a connection. Shall I proceed?

USER: You can proceed to booking.

ASSISTANT: Reservation is done.

USER: Thank you.

ASSISTANT: Thank you.