You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: Can you help me in booking my flight ticket from PHX to PHL?

ASSISTANT: Sure, I am here to help you for this. When would you like to travel?

USER: My trip dates will be Feb 28 to Mar 1st.

ASSISTANT: Is there any other specification regarding your journey?

USER: I need a direct flight.

ASSISTANT: Do you have any criteria?

USER: I prefer a economy class.

ASSISTANT: May I know your name please?

USER: I am Paul Scott.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: Its ok, thank you.

ASSISTANT: Thank you very much for approaching our agency.