You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please book a ticket from DCA to EWR? As I'm planning to visit New York.

ASSISTANT: Sure, I am here to help you for this. When are you planning your trip?

USER: My planned departure and return travel dates are 27th and 29th of Feb.

ASSISTANT: May I know your name please?

USER: My name is Katherine Harris.

ASSISTANT: Is there any connection limit?

USER: Yes, I prefer single connected flight.

ASSISTANT: Do you have any other specifications regarding your journey?

USER: No.

ASSISTANT: Sorry to inform you, no flights are found with your specifications.

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you very much for approaching our agency.