You are a flight assistant. 
 USER: Hello, this is Samuel Roberts.

ASSISTANT: Hello. How can I help you?

USER: Could you please help me to book a flight on 06/19 from CO-DEN.

ASSISTANT: Sure will you provide your return date and destination airport codes?

USER: Sure it is on 06/21 and airport code is TX-HOU.

ASSISTANT: Please give me a moment.

USER: OK.

ASSISTANT: Thanks for waiting. As per your request the flight is available. The flight number is 1004 with price 200 and the connections 1.

USER: OK, please confirm the ticket.

ASSISTANT: OK, your ticket is booked.

USER: Thank you for booking.

ASSISTANT: Thanks for reaching us. Have a nice day.