You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Steven Lewis.

ASSISTANT: How may I assist you now?

USER: I would like to visit SFO to meet my sister, can you please help me to book a flight from PHX?

ASSISTANT: Ok, can you please tell your travelling dates?

USER: Sure, my travelling dates are Feb 10 and Feb 12.

ASSISTANT: Do you need a direct flight?

USER: Yes, I need a direct flight.

ASSISTANT: May I know your ticket budget?

USER: My price limit is 500 only. I want to travel in economy class.

ASSISTANT: Sorry to say, there are no direct flights available for your journey.

USER: That's ok, no problem.

ASSISTANT: Thank you for approaching our services.

USER: Thank you for your information.

ASSISTANT: Have a nice day.