You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help?

USER: I am Brenda Green. I am planning to travel from ATL to DEN, help me in booking a flight?

ASSISTANT: Sure, please provide me your planned travel dates.

USER: My travelling dates are 04/30 to 05/02.

ASSISTANT: Do you prefer either economy or business class?

USER: Any class is ok for me.

ASSISTANT: Thank you for your details, we don't have any flight available on given dates by you.

USER: That's ok, thank you.

ASSISTANT: Thank you.