You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I want to book a flight ticket from HOU to MCO. Could you help me in booking?

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

USER: My travelling dates are from Jan 18 - 20.

ASSISTANT: Do you have any connection limit?

USER: I prefer for direct flight.

ASSISTANT: Any more requirements do you have?

USER: I need to travel in business class.

ASSISTANT: May I know your name to book a flight ticket?

USER: Christopher Taylor.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok.

ASSISTANT: Unfortunately there are no flights running on your route with your required preferences.

USER: That's ok, no problem. Thank you.

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