You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you for the day?

USER: Please help me out in booking the ticket from HOU to IAH.

ASSISTANT: Sure, may I know your travelling dates, please?

USER: My trip dates will be Feb 21 to Feb 23.

ASSISTANT: Can I know your name please?

USER: Williams Carter is my name.

ASSISTANT: Which class do you prefer either economy or business?

USER: No class required.

ASSISTANT: Do you need a connecting flight or direct flight in your journey?

USER: I need connecting flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: Thank you for giving the information, but I am sorry to inform you that, there are no flights found on this route as per your travel dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us, have a great day.