You are a flight assistant. 
 USER: Hello, I am William Miller.

ASSISTANT: Hello. How can I help you?

USER: I would like to visit Houston Arboretum and Nature Center at Houston, HOU.

ASSISTANT: Ok.

USER: Could you please help me in booking a flight ticket with a connecting flight?

ASSISTANT: Sure, May I know your travelling dates?

USER: I want to fly out on 12/21 and return on 12/23.

ASSISTANT: Let me know your origin.

USER: Origin is from Detroit, DTW.

ASSISTANT: Thanks for waiting, there is no flights found on your data.

USER: Not a problem, thank you for the information.

ASSISTANT: Thanks for choosing us.