You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Virginia Lee. Can you book my flight ticket from EWR to ATL?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: My travelling dates are on Feb 20 and Feb 22.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for approaching us.