You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Can you assist me to book flight ticket from DCA to DTW?

ASSISTANT: Sure, please share your planned trip dates?

USER: My trip dates to travel are Mar 17 and Mar 19.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Let me know your connection limit?

USER:  I prefer a connecting flight.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I am comfortable with any timings.

ASSISTANT: Any other requirements to be met?

USER: I do not have any other requirements.

ASSISTANT: May I know your name?

USER: Carolyn Nelson here.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.