You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you toady?

USER: I intend to head from Austin to meet my brother on his birthday at Oakland. Can you help me book a flight ticket under the range of 200?

ASSISTANT: Sure, please let me know your connection preference.

USER: I choose a connecting flight.

ASSISTANT: May I know your planned travelling dates?

USER: On 06/08, I will depart and return on 06/10.

ASSISTANT: Can I know your airport attributes?

USER: My journey is from AUS to OAK.

ASSISTANT: Thanks for sharing your details, there are no flights found with your essential details.

USER: OK.

ASSISTANT: May I know your name please?

USER: My name is Nicholas Martinez.

ASSISTANT: Thanks for contacting us, have a nice day.

USER: Thank you for the information.