You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Carol Scott.

ASSISTANT: How can I assist you today?

USER: Please book a ticket from AUS to DCA to meet my childhood friend.

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travelling dates are Nov 9 and Nov 11.

ASSISTANT: Do you have any specifications?

USER: Yes, my depart time is afternoon and return time is evening.

ASSISTANT: Do you have any preferences about airline?

USER: No.

ASSISTANT: Do you have any other preferences?

USER: I want single connection.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: Ok, Thank you.

ASSISTANT: Welcome, have a great day.