You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to attend a marriage in Dallas. Can you please help me for booking the flight ticket?

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

USER: My travelling dates are Nov 19 and Nov 21.

ASSISTANT: Please share me your airport codes.

USER: My airport codes are DEN and DFW.

ASSISTANT: May I know your connection limit?

USER: I would prefer single connecting flight.

ASSISTANT: Is there any class preference for you?

USER: No, I don't have any other preferences.

ASSISTANT: Your good name please.

USER: My name is Samuel Taylor.

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

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.