You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I want to book a flight ticket from PHL to IAH. Can you help me in that?

ASSISTANT: Sure, please provide your trip dates.

USER: My trip dates are Feb 28 to Mar 01.

ASSISTANT: Do you need any connection limit?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: Raymond Smith here.

ASSISTANT: There are no flights available on your routes.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.