You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be at your service today?

USER: I would like to book a ticket from PHL to HOU.

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Travelling dates are from Aug, 9 to Aug, 11.

ASSISTANT: Do you have any other specifications?

USER: I would like to return in the afternoon.

ASSISTANT: Please help me with your name for booking.

USER: I am Frank Collins.

ASSISTANT: I am sorry no flights found on your route.

USER: Thank you.

ASSISTANT: Thank you for choosing us.