You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning! How can I aid you?

USER: Can you aid me to book a flight ticket from HOU to LGA?

ASSISTANT: Sure, I can help you with that. May I know on which dates are you planning to depart and arrive?

USER: I planned my trip on the dates Dec 9 and Dec 11.

ASSISTANT: How many connections are you expecting in between your journey?

USER: I am looking for a direct flight.

ASSISTANT: Would you like to travel in economy or business class flight?

USER: No, I am happy with any class.

ASSISTANT: Please let me know if you have any other specifications.

USER: I prefer evening flight at the time of depart.

ASSISTANT: Can I have your good name please?

USER: Myself Kevin White.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for choosing us, have a nice day.