You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I would like to hangout with my friends in Chicago, can you please help me to book my flight ticket from IAH?

ASSISTANT: Sure, may I know the code of your dropping point?

USER: My destination airport code is ORD.

ASSISTANT: Please share me your willing travel dates.

USER: Sure, I want to depart on 03/19 and return back on 03/21.

ASSISTANT: Can I have your good name please?

USER: My name is Stephen Anderson.

ASSISTANT: As per your given details, there are no flights available on those dates.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for consulting us.