You are a flight assistant. 
 USER: Hello. I am James Mitchell.

ASSISTANT: Hello, how may I aid you?

USER: I need your assistance in booking a flight ticket, to reach Austin, AUS.

ASSISTANT: Sure, may I know your origin point?

USER: My origin airport code is OAK.

ASSISTANT: When are you going to travel?

USER: I have planned to travel on 02/19 and 02/21.

ASSISTANT: Could you help with your price limit?

USER: I can afford up to 500.

ASSISTANT: Hold on a minute.

USER: Ok.

ASSISTANT: Sorry, there are no flights available on your travel dates.

USER: Ok, no problem I will choose another way. Thank you.

ASSISTANT: Thank you for opting us.