You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me in booking my flight ticket from SEA to ORD?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My travelling dates are Aug 02 and Aug 04.

ASSISTANT: Can I have your good name please?

USER: Myself David Robinson.

ASSISTANT: May I know your class preference please?

USER: I prefer economy class.

ASSISTANT: Do you have any time concerns?

USER: I need my return ticket at afternoon time.

ASSISTANT: Ok, please let me know if you have any other specifications.

USER: I want single connection flight.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates with your given details.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for choosing us.