You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: On 10/02, we have a family get together so I need to go ORD to attend there, please hep me with booking a flight ticket.

ASSISTANT: Sure, may I know your source code?

USER: Sure, I will depart from HOU.

ASSISTANT: May I know your return date?

USER: I would like to go on 10/01 and return back on 10/03.

ASSISTANT: Sorry, no flights found on your requested dates.

USER: OK, not an issue. Thank you for your time.

ASSISTANT: Thank you for approaching us.