You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a flight ticket from CLT to LAS, Can you please help me for booking?

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

USER: I would like to travel on 09/28 to return on 09/30.

ASSISTANT: Is there any class preference for you?

USER: Yes, I need a economy class.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a connecting flight.

ASSISTANT: Your good name please.

USER: Ryan King.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.