You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you.

USER: I have to book a flight ticket  that I am unable to do, could you please help me in booking flight ticket on dates 03/09 and 03/11?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your source and destination airport coeds?

USER: Yes, my airport codes are Los Angeles, CA-LAX and Austin, TX-AUS.

ASSISTANT: May I know your name please?

USER: Yes, my name is Brian White.

ASSISTANT: Thank you for details, please wait for a while.

USER: Ok.

ASSISTANT: We have a connecting flight from UA airline 1003 and the price is 100. Shall I proceed?

USER: Yes, please.

ASSISTANT: Your ticket has been booked.

USER: Thank you.