You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I want to book a flight ticket from DCA to AUS, can you help me with that?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: My trip dates are 08/19 and 08/21.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your name please?

USER: I am Rebecca Lewis, and I need my return in afternoon.

ASSISTANT: Do you have any specifications?

USER: As I said, I need my return in afternoon.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: That's ok. Thank you for your service.

ASSISTANT: Thank you for reaching us.