You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me to book a flight ticket from IAD to AUS?

ASSISTANT: Can I know your travelling dates?

USER: My journey dates are Jan 28 to Jan 30.

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Let me know your name.

USER: My name is Katherine Lewis.

ASSISTANT: Connecting flight can be booked with American airlines for price 200 having flight number 1019.

USER: Ok, please proceed to book.

ASSISTANT: Ticket is booked.

USER: Thank you.

ASSISTANT: Thank you.