You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Could you please book a flight ticket from EWR to IAD?

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates are Aug 09 and Aug 11.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT:  If you can help me with your name, I can begin looking up for the availability of flights.

USER: I am Carolyn Nelson.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: I don't have any other specifications.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for approaching us.