You are a flight assistant. 
 USER: Hello, I am Eric Rodriguez.

ASSISTANT: Hello Eric, how can I assist you?

USER: I want to visit National Mall at IAD,  Can you please book a ticket for me?

ASSISTANT: Eric, may I know your journey details?

USER: Origin point: ATL.

ASSISTANT: May I know your journey dates?

USER: My depart is on 04/26 and return is on 04/28.

ASSISTANT: No flights found with your details.

USER: Thank you.

ASSISTANT: Thank you, have a nice day.