You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Emily Clark.

ASSISTANT: Nice to meet you Clark.

USER: I am planning a tour to National Zoological Park with my friends. Can you help me in booking a ticket from AUS to DCA?

ASSISTANT: That's good, I will help you. May I know on which dates you need booking?

USER: My planning dates are from 11/26 to 11/28. My price limit is 200.

ASSISTANT: Ok. The flight-1003 of Southwest airline is available for your route. Can I book this flight ticket?

USER: Please book the ticket.

ASSISTANT: Ok. Your flight ticket is booked successfully.

USER: Thank you for your help.

ASSISTANT: Thank you.