You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you the best today?

USER: I would like to book a ticket from ORD to DTW, can you please help me with that?

ASSISTANT: Sure, please share me your trip dates.

USER: The travel dates are from 12/22 to 12/24.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a direct flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Helen Hall here.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: No.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.