You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Can you please book a flight ticket from HOU to IAH?

ASSISTANT: Sure, please share your travelling dates.

USER: Thank you. I have planned my travel date as Dec 06 and Dec 08.

ASSISTANT: Do you need any connection limit?

USER: I am looking for single connecting flight.

ASSISTANT: May I know your airline preference?

USER: I would  choose normal cost airlines.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Can I know your name?

USER: Sure, myself Karen Parker.

ASSISTANT: Sorry to inform you that there are no flights available on your routes.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for choosing us.