You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me to book a flight from DTW to DCA?

ASSISTANT: May I know your travel dates?

USER: Sure, I want to travel on Dec 15 and need to return on Dec 17.

ASSISTANT: Do you prefer connecting flight?

USER: I am looking for a flight with single connection.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your good name?

USER: Nancy Campbell here.

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

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for reaching us.