You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you for the day?

USER: Can you aid me in booking a low cost ticket from SEA to AUS?

ASSISTANT: Sure, we are happy to help you. Can you please let me know your travelling dates?

USER: I am planning to start on May 24th and return back on May 26th.

ASSISTANT: Ok, do you need any halt in between journey?

USER: Not compulsory. I can afford up-to 200.

ASSISTANT: Thanks for providing details, we are unable to provide flights on your preferable dates of travel.

USER: Welcome.

ASSISTANT: Thank you for choosing us.