You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to attend music concert at IAD, can you please help me with booking a flight ticket from DCA?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: I would like to take off on Mar 26 and return on Mar 28.

ASSISTANT: Do you prefer any halt in between your journey?

USER: I am looking for a connecting flight.

ASSISTANT: Please let me know if you have any other specifications.

USER: I don't have any other specification.

ASSISTANT: Can I have your good name please?

USER: My name is Donna Campbell.

ASSISTANT: Sorry, no flights available with your given details on those dates.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.