You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you help me in booking from DEN to ATL?

ASSISTANT: May I know your trip dates?

USER: My travelling dates are from Sept 28 to Sept 30.

ASSISTANT: Do you prefer any specifications?

USER: I prefer business class.

ASSISTANT: I am sorry, no flights found in business class.

USER: My name is Joseph young. Thank you.

ASSISTANT: Please share your name? Thank you.