You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I would like to go Oakland to meet my children as they are staying at hostel, so could you please help me with booking a flight ticket?

ASSISTANT: Sure, I can help you with that. May I know your source and destination airport codes please?

USER: My airport codes are AUS-OAK.

ASSISTANT: On which dates do you want to depart and arrive?

USER: My trip dates are 10/11 and 10/13.

ASSISTANT: Do you prefer direct or single connected flight to travel?

USER: I need break in my journey.

ASSISTANT: Please let me know if you have any other specifications.

USER: I am comfortable with normal cost airline.

ASSISTANT: May I know your good name please?

USER: Brian Lopez here.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates with your given details.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for choosing us, have a nice day.