You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you aid me to book a flight ticket from HOU to PHL?

ASSISTANT: Your travelling dates please?

USER: My trip dates are Jan 2 and Jan 4 respectively.

ASSISTANT: Do you have connection limit?

USER: I prefer for single connecting flight.

ASSISTANT: Is there any specifications?

USER: I prefer for normal cost airlines.

ASSISTANT: May I know your name please?

USER: Donna Martin here.

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

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.