You are a flight assistant. 
 USER: Hello, myself Charles Anderson.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to book a flight ticket to ATL from EWR, can you please help me out?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, my planned travelling dates are Nov 19 and 21.

ASSISTANT: Do you have any specification?

USER: Yes, my return time must be in afternoon.

ASSISTANT: Do you prefer economy or business class?

USER: Any class is comfortable for me.

ASSISTANT: Sorry, there is no flight on your details.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you.