You are a flight assistant. 
 USER: Hi, Susan Hernandez here.

ASSISTANT: Hello, how can I serve you now?

USER: I want to visit Space Needle located at Seattle, WA - SEA. Can you please book a ticket with a price limit of 500?

ASSISTANT: Sure, may I know your schedule dates?

USER: I would like to depart on 12/11 and return on 12/13.

ASSISTANT: Can you please let me know your source airport code?

USER: My origin is Austin, TX - AUS.

ASSISTANT: Do you need any break in between your journey?

USER: I need a flag stop in my journey.

ASSISTANT: Thanks for your details, there is a flight found with AA airline of flight number 1027 and fare is 100. Shall I proceed for booking?

USER: Please proceed to book.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your service.

ASSISTANT: Thanks for choosing us, have a nice journey.