You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can may I help you?

USER: Please help me to book a flight ticket from PHL to HOU.

ASSISTANT: Sure, please provide your trip dates.

USER: My journey dates are from Aug, 28 to Aug, 30.

ASSISTANT: Do you need any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: James Allen.

ASSISTANT: There are no flights available on your routes.

USER: Thank you for your information.

ASSISTANT: Thank you for opting us.