You are a flight assistant. 
 USER: Hi. This is Laura Mitchell from Phoenix.

ASSISTANT: Hello, how may I assist you today?

USER: Can I have the flights availability routing from Phoenix, PHX to Washington, IAD?

ASSISTANT: Sure, we will help you in searching a flight for you.

USER: Thank you.

ASSISTANT: Can you please let me know your journey dates that you prefer to travel?

USER: I want to start on 12/04, and return will be on 12/06.

ASSISTANT: How much you can spend for flight ticket?

USER: I can spend only 200 for my ticket.

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

USER: That's ok, I will choose my own transportation for my journey. Thanks for your effort.

ASSISTANT: Thank you for reaching us. Have a nice day.