You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I render you?

USER: Can you please assist me in booking a ticket to Washington to attend a family function?

ASSISTANT: Sure, we are here to assist you in booking. Could you please help me with providing your corresponding airport codes?

USER: My airport codes are from AUS to DCA.

ASSISTANT: Kindly assign your preferred dates of travelling?

USER: My preferred dates are from 11/17 to 11/19.

ASSISTANT: Do you prefer any halt in between journey?

USER: I need a direct flight.

ASSISTANT: Ok, let me check the availability. Can I have your name please?

USER: I am Carolyn Wright.

ASSISTANT: Sorry Carolyn,  we don't have direct flight on your dates.

USER: Ok, no problem.

ASSISTANT: Thank you for consulting us.

USER: Thank you.