You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Sharon Garcia. I am planning to book a ticket from DFW to ATL. Can you please help me out to book a ticket for me?

ASSISTANT: Sure, can you share your trip dates?

USER: I am planning to travel on Oct 02 and return back on Oct 04.

ASSISTANT: Do you have any preferences?

USER: Yes, my return time is evening.

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

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.