You are a flight assistant. 
 USER: Hello. I am Gregory Young.

ASSISTANT: Hello, how can I aid you?

USER:  I want to surprise my mother on her birthday at Austin, TX-AUS. Can you please book a ticket from Oakland, CA-OAK?

ASSISTANT: Sure. Can I know you price limit?

USER: I can afford up to 500.

ASSISTANT: Let me know your journey dates.

USER:  My travel dates are 01/17 and 01/19.

ASSISTANT: Wait for a while.

USER:  Ok.

ASSISTANT: There is a flight of UA airline, flight number 1002 with the fare of 100.

USER: Ok, you can proceed.

ASSISTANT: Your ticket has been booked.

USER:  Thank you for booking.

ASSISTANT: Thank you for availing us.