You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: May I know your travel dates?

USER: The travel dates are from 08/14 to 08/16.

ASSISTANT: Do your prefer connecting flight?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your good name?

USER: Raymond Baker here.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

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

ASSISTANT: Thank you for reaching us.