You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I have a plan to participate in the baseball tournament in OAK, can you please aid me in booking a flight ticket from AUS?

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

USER: My travelling dates are Dec 14th and Dec 16th.

ASSISTANT: Do you have any specifications about flight connections?

USER: I need a direct flight.

ASSISTANT: Do you have any preferences about class?

USER: No.

ASSISTANT: Please mention your name.

USER: Brenda Williams.

ASSISTANT: There are no flights found under your preferable details.

USER: Ok, no problem. Thank you.

ASSISTANT: Welcome, have a great day.