You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book a flight ticket from LAS to DFW?

ASSISTANT: Sure, I am glad to help you. Can you please share your travel dates?

USER: My trip dates are Nov 13 and Nov 15.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight to reach my destination.

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: No, thank you for asking.

ASSISTANT: May I know your good name to proceed further?

USER: Samuel Campbell here.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights found on your specified travel dates.

USER: Ok, not a problem. Thank you for checking.

ASSISTANT: Thank you for approaching us.