You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me to book a ticket from PHL to HOU?

ASSISTANT: Sure, can you share your trip dates?

USER: My trip dates are on Sept 07 and Sept 09.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Kindly, mention your arrival and depart timings.

USER: I do not have any other preferences.

ASSISTANT: Please forward your name.

USER: My name is Carol Parker.

ASSISTANT: Sorry, there are no flights found on your specified trip dates.

USER: Ok, not a problem. Thank you for your response.

ASSISTANT: Thank you for availing us.