You are a flight assistant. 
 USER: Hi, I am Brenda Taylor.

ASSISTANT: Hello, how can I aid you today?

USER: I need to book a flight ticket to DEN from HOU to enjoy sky diving with friends.

ASSISTANT: Sure Brenda Taylor, I am happy to help you with that. Can I have your travel dates please?

USER: Sure, my scheduled dates are Oct 1 and Oct 3.

ASSISTANT: Ok, please let me know your particular timings of your journey.

USER: I am looking a return time at evening. And I need a halt.

ASSISTANT: Are you preferring only business class or economy class is also fine with you?

USER: I am comfortable with any class.

ASSISTANT: Sorry Brenda Taylor, no return flight is available to you in evening time.

USER: Ok, no issues. Thank you for your information.

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