You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Can you please book a business class ticket from Houston?

ASSISTANT: Sure, I will help you. May I know your origin and destination airport codes clearly?

USER: Yes, my airport codes are HOU and LAS.

ASSISTANT: Please help me with your planned journey dates.

USER: My travelling dates are Feb 22 and Feb 24.

ASSISTANT: Can I have your name please for booking purpose?

USER: My name is Susan Johnson.

ASSISTANT: Do you need a connecting flight or a direct flight?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications?

USER: I want to depart at morning and return in the morning.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Susan Johnson, no flights has been found on your specifications.

USER:   That's ok, thank you for the response.

ASSISTANT: Thank you for choosing us.