You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Can you help me in booking from IAD to ATL, as there is a business meeting to attend?

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: I am Jessica Lee.

ASSISTANT: Do you need a direct or connecting flight?

USER: I need a direct flight.

ASSISTANT: Please help me with your planned travelling dates.

USER: My trip dates are Nov 15 to Nov 17.

ASSISTANT: Please let me know with your preferred class to fly.

USER: I am ok with any class.

ASSISTANT: Do you have any other preferences in your journey?

USER: I prefer a flight which depart in evening.

ASSISTANT: Jessica Lee, I am really sorry to inform you that there is no flight available for your journey.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us. Have a great time.