You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

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

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: My journey dates are Sept 03 and Sept 05.

ASSISTANT: Ok, please let me know your preferable airlines.

USER: I am comfortable with any airline.

ASSISTANT: Do you need any breaks in between your journey?

USER: I need a connecting flight.

ASSISTANT: Are you looking for any specific class to travel?

USER: No.

ASSISTANT: Can I have your good name please proceed further?

USER: I am Jeffrey Moore.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Jeffrey Moore, no flight is available to you on your dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.