You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: My name is Catherine Lewis. I need your help in booking a flight ticket from Austin on 01/18.

ASSISTANT: Yes Catherine, can I know the return details?

USER: The codes of my journey are from AUS to OAK.

ASSISTANT: And the return date?

USER: My return day is on 01/20.

ASSISTANT: Do you have any additional preferences?

USER: Yes, I need my ticket price should not exceed 200 and connections limit as 1.

ASSISTANT: Flight 1009 has matched with your preferences, would you like me to book the ticket?

USER: Yes, please proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thank you, have a good day.