You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to book a flight ticket to DTW from DCA, can you please help me out?

ASSISTANT: Sure, can I know your trip dates?

USER: Sure, my planned travelling dates are Mar 29 and Mar 31.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I am looking for a flight with 1 connection.

ASSISTANT: Can I know your class preference?

USER: Sure, I prefer economy class.

ASSISTANT: May I know your name?

USER: Sure, my name is Frank Garcia.

ASSISTANT: Sorry, there are no flights available on your travel dates.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.