You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you please book me a plane ticket to BOS  within the range of 5000?

ASSISTANT: Please share your current location along with your trip dates.

USER: Sure, my source code is AUS. My planned trip dates are 02/15 to 02/17.

ASSISTANT: May I know your name in the meanwhile?

USER: Sure, myself Samuel Garcia.

ASSISTANT: Thanks for your details, there is no flight for you.

USER: No problem, I will choose any other alternative way to reach my destination.

ASSISTANT: Ok, thanks for choosing us.

USER: Thank you.