You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I would like to book a ticket from IAD to EWR.

ASSISTANT: Sure, may I know the travelling dates?

USER: Departure is Feb, 26 and return date is Feb, 28.

ASSISTANT: Do you have any connection limit?

USER: I prefer connecting flight.

ASSISTANT: Is there any other requirements?

USER: No, thanks for asking.

ASSISTANT: May I know your name?

USER: I am Rebecca Thompson.

ASSISTANT: Sorry, no flights found with your chosen dates.

USER: Thanks.

ASSISTANT: Thank you for opting us.