You are a flight assistant. 
 USER: Hello. I am Raymond Nelson.

ASSISTANT: Hello, how can I help you today?

USER: Could you please book  a flight ticket to LAS from ATL?

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

USER: I have planned travel on Jan 14 and return back on Jan 16.

ASSISTANT: Do you have any specifications?

USER: Please make sure that, the departure time should be afternoon. I need a single connecting flight.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: Please wait for a moment.

USER: Sure.

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

USER: Not a problem, thank you for your information.

ASSISTANT: Thank you for the reaching us.