You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: I want to attend a Seminar in Houston. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable dates of travelling?

USER: My travelling dates are Dec 12 and Dec 14.

ASSISTANT: Ok, may I know your regional airport codes for booking?

USER: My airport codes are DEN and HOU.

ASSISTANT: On whose name I have to book the flight ticket?

USER: Jason Carter.

ASSISTANT: Do you have any connection limit?

USER: I prefer single connecting flight.

ASSISTANT: Any more specifications do you have?

USER: I want to depart in afternoon.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok, I prefer business class.

ASSISTANT: We are apologize that, there are no flights running towards your region with your requested dates of travelling.

USER: Anyway, thanks for the information.

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