You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am looking for a flight from DCA to SFO, can you help me out in booking the flight ticket?

ASSISTANT: Sure, I am here to help you with your concern. May I know your trip dates?

USER: Thank you and my trip dates are from Feb 18th till Feb 20th.

ASSISTANT: Do you have any connection limit preference?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No, thanks for asking.

ASSISTANT: Could you help me with your name please?

USER: Myself Emma Turner.

ASSISTANT: Sorry, there is no flight available for the mentioned dates.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.