You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Please can you help me in booking a flight ticket from LAS to ATL?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Ok, please book for the dates Aug 23 and Aug  25.

ASSISTANT: Can you please share your connection limit?

USER: Please book a connecting flight.

ASSISTANT: Do you have any other requirements?

USER: Yes, I need a economy class flight.

ASSISTANT: May I know your name please?

USER: My name is Donna clark.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thank you for opting us.