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

ASSISTANT: Hello, how can I be your helping hand today?

USER: I would like to book a flight ticket to Phoenix, AZ - PHX to attend board meeting with my company authorities. Can you please help me for booking?

ASSISTANT: Sure, may I know your journey dates?

USER: I will depart on 12/16 and return on 12/18.

ASSISTANT: Ok, Can you please provide your source point?

USER: My source is Austin, TX - AUS.

ASSISTANT: Ok, please share your budget.

USER: I can spend up to 5000.

ASSISTANT: Thanks for your information. Unfortunately, there were no flights found based on your specified dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.