You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am looking to book a flight ticket from DCA to ORD. Can you help me for that?

ASSISTANT: Sure, can I know your travelling dates?

USER: My travelling dates are Sep 14 and Sep 16.

ASSISTANT:  On which name shall I reserve flight ticket?

USER: My name is Dennis Hernandez.

ASSISTANT: Do you need any specifications?

USER: I prefer to book a direct flight in my journey.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.