You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to book a flight ticket from EWR to IAD?

ASSISTANT: Sure, please share your journey dates?

USER: My travelling dates are Mar 4 to Mar 6.

ASSISTANT: Do you have any specifications?

USER: I want to return in the afternoon. And I prefer business class.

ASSISTANT: May I know your good name?

USER: Robert Edwards.

ASSISTANT: Sorry, no flights found on your given details.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.