You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you please help me in booking a flight ticket from PHL to HOU?

ASSISTANT: Sure, please help me with your travel dates.

USER: Sure, my travel dates are from Feb 16 to Feb 18.

ASSISTANT: Do you have any preferences?

USER: I need a direct flight.

ASSISTANT: Is there any other preferences?

USER: No.

ASSISTANT: May I know your name?

USER: Nancy Hernandez here.

ASSISTANT: Sorry, I did not find any flights for you.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.