You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Rachel Hill.

ASSISTANT: How can I assist you?

USER: I am planning to visit National Art of Gallery at Denver, can you please help me with booking a flight ticket?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please let me know your travel dates.

USER: Sure, I would like to take off on 08/26 and return back from Houston on 08/28.

ASSISTANT: Yes, can I know your airport codes?

USER: My source airport code is HOU and the destination airport code is DEN.

ASSISTANT: The flight 1021 of UA airlines is available on your requested dates with a price of 100 and with 1 connection. Is it ok for you?

USER: That's perfect, please proceed with the booking.

ASSISTANT: Rachel, your ticket is booked successfully.

USER: I appreciate your help, thank you for your assistance.

ASSISTANT: You are welcome.