You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Scott Lee.

ASSISTANT: How may I help you?

USER: I am planning to book a ticket to meet my friend at TX-DFW. Can you please help me out to book a ticket from GA-ATL?

ASSISTANT: Ok, now please share your travel dates?

USER: I would like to travel on 03/23 and return back on 03/25.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

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

ASSISTANT: Thank you.