You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Ronald Moore need to book a ticket to with single connection and in business class, can you please help me in booking?

ASSISTANT: Sure, can you share your journey dates?

USER: My journey dates are from 08/09 to 08/11, need to depart in the evening.

ASSISTANT: May I know your journey airport codes?

USER: I would like to board from DEN and arrival at DFW.

ASSISTANT: Do you have any preferences?

USER: Already mentioned.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.