You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dorothy Robinson.

ASSISTANT: How can I assist you?

USER: I have to to attend NHL Stanley cup playoffs in Austin as I am a hockey player. Can you please book a ticket?

ASSISTANT: Sure, we are here to help you. Can I have your airport codes please?

USER: I would like to depart from CA - OAK and return from TX - AUS.

ASSISTANT: Do you have any specifications to met?

USER: I can effort 1000. I need a direct flight.

ASSISTANT: When do you want to travel?

USER: I have to board on 04/16 and arrive on 04/18.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience. Unfortunately, we do not found any flight that matches your requirements.

USER: Ok, no problem. Thanks for your kind information.

ASSISTANT: Thank you for approaching us.