You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I need a direct flight for my journey to IAH from PHL in December month. Can you help me in booking a flight ticket?

ASSISTANT: Sure, can you share your journey dates?

USER: Sure, my journey dates are Dec 20 and Dec 22.

ASSISTANT: Do you have any preferences?

USER: No.

ASSISTANT: May I know your name?

USER: Sure, my name is Raymond Brown.

ASSISTANT: Sorry, there is no direct flight on your given dates.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for reaching us.