You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Dennis Brown. I am planning to visit Denver for a business meeting, can you please help me out with booking of a flight ticket from HOU to DEN?

ASSISTANT: Sure, we are here to help you.

USER: Thank you for your response.

ASSISTANT: Can you share me your trip dates?

USER: I want to take off on Oct 01 and book my return ticket also on Oct 03.

ASSISTANT: Do you need any way station in your journey?

USER: No, I want a direct flight.

ASSISTANT: May I know your departure time and arrival time?

USER: I want to take off in afternoon time.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Sorry to inform you that, there are no flights available with your needs.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.