You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Laura Thomas. I would like to visit Atlanta to meet my best friend, can you help me to book a flight ticket from DEN to ATL?

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

USER: My travelling dates are 04 and 06 of May.

ASSISTANT: Ok, please provide me your class preference.

USER: No, I would like to depart in the afternoon.

ASSISTANT: Ok, please wait for a while.

USER: I need a direct flight.

ASSISTANT: Sorry to inform you that there is no direct flight available on your preferred travel dates.

USER: Oh! that very sad to hear, thank you.

ASSISTANT: You are welcome, thank you for choosing us.